Title: Fatal error when try to enable plugin
Last modified: August 31, 2016

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# Fatal error when try to enable plugin

 *  Resolved [jonathanmercutio](https://wordpress.org/support/users/jonathanmercutio/)
 * (@jonathanmercutio)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/)
 * Hi,
 * WordPress Version: 4.4.2
    MetaBox: 4.8.1 PHP: 5.6.17
 * During enable I got an error:
 * Fatal error: Class ‘RWMB_Core’ not found in /wp-content/plugins/meta-box/inc/
   loader.php on line 125
 * Please help
 * [https://wordpress.org/plugins/meta-box/](https://wordpress.org/plugins/meta-box/)

Viewing 10 replies - 1 through 10 (of 10 total)

 *  Plugin Author [Anh Tran](https://wordpress.org/support/users/rilwis/)
 * (@rilwis)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102474)
 * Which theme are you using? Do you see the same bug with default 2016 theme?
 *  Thread Starter [jonathanmercutio](https://wordpress.org/support/users/jonathanmercutio/)
 * (@jonathanmercutio)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102504)
 * Hi Thanks for your fast response, I use this theme
 * [http://cargo.bold-themes.com/delivery-express/](http://cargo.bold-themes.com/delivery-express/)
   from bold-themes
 * With default 2016 theme shows the same “Fatal error: Class ‘RWMB_Core’ not found
   in \\WDP\DFS\45\2\5\8\4513111852\user\sites\1627032.site\www\wp-content\plugins\
   meta-box\inc\loader.php on line 125”
 * thanks for your help
 *  Plugin Author [Anh Tran](https://wordpress.org/support/users/rilwis/)
 * (@rilwis)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102522)
 * Can you:
 * 1. Update the plugin to 4.8.2 (latest) and see if it works
    2. And contact to
   the theme author (I’m sure you have them supported) and ask them to update the
   code in the theme?
 *  Thread Starter [jonathanmercutio](https://wordpress.org/support/users/jonathanmercutio/)
 * (@jonathanmercutio)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102528)
 * Hi, thanks for your answer.
 * I installed the 4.8.2 version (latest) and when I activated this show me the 
   same error
 * Fatal error: Class ‘RWMB_Core’ not found in \\WDP\DFS\45\2\5\8\4513111852\user\
   sites\1627032.site\www\wp-content\plugins\meta-box\inc\loader.php on line 125
 * regards
 *  Plugin Author [Anh Tran](https://wordpress.org/support/users/rilwis/)
 * (@rilwis)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102534)
 * Which host are you using? Is that a Windows hosting?
 *  Thread Starter [jonathanmercutio](https://wordpress.org/support/users/jonathanmercutio/)
 * (@jonathanmercutio)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102537)
 * Hello. Yes I test it on hostgator and work fine, but in other host, Windows host,
   the error happen.
 * Tell me any form of solve this different of change hosting?
 * regards
 *  Plugin Author [Anh Tran](https://wordpress.org/support/users/rilwis/)
 * (@rilwis)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102546)
 * Can you send me the FTP info and admin account to check the bug? I think I need
   that to debug the problem as I couldn’t replicate the bug on my computers (Mac,
   Linux and Windows). Please send via the contact form at [https://metabox.io](https://metabox.io).
 * Thanks
 *  Thread Starter [jonathanmercutio](https://wordpress.org/support/users/jonathanmercutio/)
 * (@jonathanmercutio)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102547)
 * Hi, Thanks for the answer.
 * I send you the info for FTP.
 * Regards
 *  Plugin Author [Anh Tran](https://wordpress.org/support/users/rilwis/)
 * (@rilwis)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102552)
 * We have resolved the bug.
 * FYI: the bug comes from wrong path of files returned by the plugin autoloader.
   I have committed the fix on the Github. New version will be released soon.
 *  Thread Starter [jonathanmercutio](https://wordpress.org/support/users/jonathanmercutio/)
 * (@jonathanmercutio)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102569)
 * thanks

Viewing 10 replies - 1 through 10 (of 10 total)

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 * 10 replies
 * 2 participants
 * Last reply from: [jonathanmercutio](https://wordpress.org/support/users/jonathanmercutio/)
 * Last activity: [10 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-when-try-to-enable-plugin/#post-7102569)
 * Status: resolved