send button not working

Hi..Thank you for your awesome plugin. i have a problem with the send button. it works perfectly at first and i got the emails also. but when i edit the code inorder to add one more field into the form the problem starts. now after i click on the send button nothing is happening. how can i fix this?
i just updated contact-form.view.php by inserting the following code after name:

<!--phone-->
 <div class="control-group form-group<?php if (isset($contact->Errors['phone'])) echo ' error has-error'; ?>">
                <label for="cscf_phone"><?php _e('Phone:','cleanandsimple');?></label>
                <div class="<?php echo cscf_PluginSettings::InputIcons() ? "input-group" : ""; ?>">
                    <?php if ( cscf_PluginSettings::InputIcons() == true ) { ?>
                        <span class="input-group-addon"><span class="glyphicon glyphicon-user"></span></span>
                    <?php } ?>
                    <input class="form-control input-xlarge"
                       data-rule-required="true"
                       data-msg-required="<?php _e('Please give your phone number.','cleanandsimple');?>"
                       type="text" id="cscf_phone" name="cscf[phone]"
                       value="<?php echo $contact->Phone; ?>"
                       placeholder="<?php _e('Your Phone Number','cleanandsimple');?>"
                    />
                </div>
               <span for="cscf_phone" class="help-inline help-block error" style="display:<?php echo isset($contact->Errors['phone']) ? 'block' : 'none'; ?>;">
                    <?php if (isset($contact->Errors['phone'])) echo $contact->Errors['phone']; ?>
                </span>
            </div>

and inserted this line in class.cscf_contact.php

//phone
	if (strlen($this->Phone) == 0) $this->Errors['phone'] = __('Please give your phone number.','cleanandsimple');