Redirect to blank page after update, preview or save plugin setting

Hi thanks but i’m quite new to all this.

You mentioned to use a FTP program or the file manager for your server control panel to download and look at the error_log files both in /public_html and in /public_html/wp-admin. I have no idea what this is and maybe you could help by guiding me?

Too bad I could not recall what plugins I installed to create this mess..

Thanks linux4me2. I’ve logged into the cpanel and saw the error but do not know what they meant. Can help?
Error as below:

PHP error_log:

[ Moderator note: Please use bacticks or the code button to post log data like this. ]

/home2/xxxxx/public_html/wp-content/plugins/foliopress-wysiwyg/custom-config/error_log:
[21-Dec-2012 18:40:55] PHP Warning:  call_user_func_array() [<a href='function.call-user-func-array'>function.call-user-func-array</a>]: First argument is expected to be a valid callback, 'Array' was given in /home2/xxxxx/public_html/wp-includes/plugin.php on line 406
[21-Dec-2012 18:41:08] PHP Warning:  call_user_func_array() [<a href='function.call-user-func-array'>function.call-user-func-array</a>]: First argument is expected to be a valid callback, 'Array' was given in /home2/xxxxx/public_html/wp-includes/plugin.php on line 406

/home2/xxxxx/public_html/wp-admin/error_log:
[29-Dec-2012 19:32:21] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:32:21] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:32:32] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:32:32] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:33:21] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:33:21] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:34:05] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:34:05] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:35:23] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:35:23] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:35:52] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:35:52] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:36:12] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:36:12] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:36:21] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:36:21] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:36:26] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:36:26] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:38:46] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:38:47] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:38:50] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:38:50] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:38:55] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:38:55] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:39:11] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:39:11] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:39:13] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:39:13] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568
[29-Dec-2012 19:39:28] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin.php on line 1241
[29-Dec-2012 19:39:28] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home2/xxxxx/public_html/wp-content/plugins/easywpseo/onpageseo-admin-license.php:200) in /home2/xxxxx/public_html/wp-includes/option.php on line 568

/home2/xxxxx/public_html/error_log:
[19-Dec-2012 15:54:55] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:54:58] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:55:00] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:55:02] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:55:05] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:55:09] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:55:16] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:55:25] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:55:29] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 32
[19-Dec-2012 15:59:57] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 19
[19-Dec-2012 15:59:59] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 19
[19-Dec-2012 16:00:01] PHP Parse error:  syntax error, unexpected '<' in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 19
[19-Dec-2012 17:20:24] PHP Parse error:  syntax error, unexpected $end in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/index.php on line 112
[20-Dec-2012 05:38:23] PHP Warning:  Missing argument 1 for ta_post_rating(), called in /home2/xxxxx/public_html/wp-content/themes/newlaunchvista/single.php on line 28 and defined in /home2/xxxxx/public_html/wp-content/plugins/author-hreview/include/review_template.php on line 17
[29-Dec-2012 10:37:28] PHP Fatal error:  Call to a member function find() on a non-object in /home2/xxxxx/public_html/wp-content/plugins/follow-nofollow-control/nofollow-control.php on line 124

The above are all the errors in the log. Not sure why there is an error with easyseo since it is working well.

There are links which I have not added in and not sure why they are in the log like Molly and newmarketsonline.

Hope anyone kind enough to help as I don’t have a friendly neighbourhood geek who can help me.

ps: Thanks moderator. Will remember to use code button for logs

<?php
if (!function_exists ('is_admin'))
{
        header('Status: 403 Forbidden');
        header('HTTP/1.1 403 Forbidden');
        exit();
}
elseif (!class_exists('OnPageSEOLicense'))
{
        class OnPageSEOLicense
        {
                /**
                 * Instance Variables
                 */
                var $licenseURL = 'http://www.easywpseo.com/license/';
                var $checkTime = 43200; // seconds
                var $licenseOptionName;
                var $licenseError = 0;
                var $license = array();
                var $options;
                /**
                 * PHP 4 constructor (for backwards compatibility)
                 *
                 * @param       void
                 * @return      bool    true
                 */
                function OnPageSEOLicense(&$options)
                {
                        $this->__construct(&$options);
                        return;
                }
                /**
                 * PHP 5 constructor
                 *
                 * @param       void
                 * @return      void
                 */
                function __construct(&$options)
                {
                        // Plugin Options
                        $this->options = &$options;
                        // Set License Option Name
                        $this->licenseOptionName = OPSEO_PREFIX.'_license_check';
                        // Validate License Email & Serial Number
                        if($this->validateEmailSerial())
                        {
                                // Check License
                                $this->lastLicenseCheck();
                        }
                }
                /**
                 * Make sure user has entered license email and serial number
                 *
                 * @param       void
                 * @return      bool
                 */
                function validateEmailSerial()
                {
                        if((!isset($this->options['license_email']) || (strlen(trim($this->options['license_email'])) == 0)) || (!isset($this->options['license_serial']) || (strlen(trim($this->options['license_serial'])) == 0)))
                        {
                                // No Email and/or Serial Number
                                $this->licenseError = 1;
                                return false;
                        }
                        else { return true; }
                }
                function lastLicenseCheck()
                {
                        // Get Options
                        $this->getOptions();
                        // Last Update Check
                        if( strtotime(date('Y-m-d H:i:s')) > (strtotime($this->license['last_checked']) + $this->checkTime) )
                        {
                                $this->getLicenseInfo();
                                // Update If No Errors
                                if(!$this->licenseError) { update_option($this->licenseOptionName, $this->license); }
                        }
                }
                function getOptions()
                {
                        // Last Update Check
                        $this->license = get_option($this->licenseOptionName);
                        // If User Changed License
                        $this->licenseChanged();
                        if(!$this->license)
                        {
                                // Get License Information
                                $this->getLicenseInfo();
                                if(!$this->licenseError)
                                {
                                        // Create New Option
                                        $this->license = array('last_checked'=>date('Y-m-d H:i:s'), 'license_type'=>$this->license['license_type'], 'trial_expiration'=>$this->license['trial_expiration'], 'registered'=>$this->license['registered'], 'status'=>$this->license['status'], 'upgrade_url'=>$this->license['upgrade_url'], 'upgrade_message'=>stripslashes($this->license['upgrade_message']));
                                        add_option($this->licenseOptionName, $this->license);
                                }
                        }
                }
                function getLicenseInfo()
                {
                        // Request License Info From External URL
                                $this->license['license_type'] = "developer";
                                return('license');
                        // Check If Trial License Has Expired
                        // NO Need :P
                        // Nulled By Kuasha420 @ blackhatteam.com :D
                }

                function getLicenseName()
                {
                        switch($this->license['license_type'])
                        {
                                case 'free':
                                        return('Free');
                                        break;
                                case 'trial':
                                        return('Expiring Trial');
                                        break;
                                case 'single':
                                        return('Single Site');
                                        break;
                                case 'multi':
                                        return('Multi Site');
                                        break;
                                case 'developer':
                                        return('Developer');
                                        break;
                                case 'expired':
                                        return('Expired Trial');
                                        break;
                                default:
                                        return('');
                                        break;
                        }
                }
                function getLicenseUsage()
                {
                        switch($this->license['license_type'])
                        {
                                case 'free':
                                        return('You can use this on an unlimited number of sites that you own and also on your client\'s sites.');
                                        break;
                                case 'trial':
                                        return('Your license will expire '.$this->trialPeriodLeft().'.');
                                        break;
                                case 'single':
                                        return('You can use the plugin on one site.');
                                        break;
                                case 'multi':
                                        return('You can use the plugin on an unlimited number of sites that you own. (You cannot install the plugin on sites you do not personally own.)');
                                        break;
                                case 'developer':
                                        return('You can use the plugin on an unlimited number of sites that you own and also on your clients\' sites.');
                                        break;
                                case 'expired':
                                        return('Your trial has expired and you must upgrade to continue using the plugin.');
                                        break;
                                default:
                                        return('');
                                        break;
                        }
                }
                function trialPeriodLeft()
                {
                        $secondsLeft = strtotime($this->license['trial_expiration']) - strtotime(date('Y-m-d H:i:s'));
                        $timeLeft = (int)($secondsLeft / 86400);
                        if($timeLeft > 1) { return('in'.$timeLeft.' days'); }
                        elseif($timeLeft == 1) { return('in'.$timeLeft.' day'); }
                        else { return('today'); }
                }
                function licenseChanged()
                {
                        if( isset($this->options['old_license_email']) && (strlen(trim($this->options['old_license_email'])) > 0) && isset($this->options['old_license_serial']) && (strlen(trim($this->options['old_license_serial'])) > 0) && (($this->options['license_email'] != $this->options['old_license_email']) || ($this->options['license_serial'] != $this->options['old_license_serial'])) )
                        {
                                if(sizeof($this->license) > 0) { delete_option($this->licenseOptionName); $this->license = array(); }
                        }
                }
                function isLicenseError()
                {
                        return($this->licenseError);
                }
                function getUpgradeURL()
                {
                        return($this->license['upgrade_url'].'?email='.$this->options['license_email'].'&serial='.$this->options['license_serial']);
                }
                function getLicenseURL()
                {
                        return($this->licenseURL.'?email='.$this->options['license_email'].'&serial='.$this->options['license_serial']);
                }
                function getLicenseType()
                {
                        return($this->license['license_type']);
                }
                function getUpgradeMessage()
                {
                        return(stripslashes($this->license['upgrade_message']));
                }
        }
}
?>