Title: PHP Warning in debug.log
Last modified: October 16, 2016

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# PHP Warning in debug.log

 *  [ngrudev](https://wordpress.org/support/users/ngrudev/)
 * (@ngrudev)
 * [9 years, 8 months ago](https://wordpress.org/support/topic/php-warning-in-debug-log-2/)
 * Hi
 * I have multisite. The plugin is network activated. I have a lot of lines with
   this error in the debug.log file:
 * [16-Oct-2016 13:31:12 UTC] PHP Warning: call_user_func_array() expects parameter
   1 to be a valid callback, class ‘R3DF_Dashboard_Language_Switcher’ does not have
   a method ‘on_admin_bar_page_lang’ in /home/lugabglj/public_html/test/bg_wp/wp-
   includes/plugin.php on line 600
 * Thanks for your support
    Niki

The topic ‘PHP Warning in debug.log’ is closed to new replies.

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## Tags

 * [PHP Warning](https://wordpress.org/support/topic-tag/php-warning/)

 * 0 replies
 * 1 participant
 * Last reply from: [ngrudev](https://wordpress.org/support/users/ngrudev/)
 * Last activity: [9 years, 8 months ago](https://wordpress.org/support/topic/php-warning-in-debug-log-2/)
 * Status: not resolved