Title: Plugin Activation error (while activating my plugins)
Last modified: August 19, 2016

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# Plugin Activation error (while activating my plugins)

 *  [msuh](https://wordpress.org/support/users/msuh/)
 * (@msuh)
 * [17 years, 2 months ago](https://wordpress.org/support/topic/plugin-activation-error-while-activating-my-plugins/)
 * Hi,
    This is an urgent request as ALL the plugins were mysteriously deactivated
   when i tried to activate “tweetback” plugin.
 * When I went back to plugins page and saw ALL plugins automatically deactivated
   and tried to activate any of them this error showed up:
 * Warning: in_array() [function.in-array]: Wrong datatype for second argument in/
   home/XXXXXX/public_html/wp-admin/includes/plugin.php on line 268
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/XXXXX/public_html/wp-admin/includes/plugin.php:268) in /home/XXXXXX/
   public_html/wp-includes/pluggable.php on line 850
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/XXXXXX/public_html/wp-admin/includes/plugin.php:268) in /home/XXXXXX/
   public_html/wp-includes/pluggable.php on line 850
 * I have tried replacing “wp-admin” and “wp-includes” but still it aint working.
 * Can anyone help please???

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [msuh](https://wordpress.org/support/users/msuh/)
 * (@msuh)
 * [17 years, 2 months ago](https://wordpress.org/support/topic/plugin-activation-error-while-activating-my-plugins/#post-955492)
 * **someone in there? this is an urgent help appeal!**
 *  [cynthea](https://wordpress.org/support/users/cynthea/)
 * (@cynthea)
 * [17 years, 2 months ago](https://wordpress.org/support/topic/plugin-activation-error-while-activating-my-plugins/#post-955726)
 * I just had this same problem when trying to activate a different plugin. Turned
   out there was a database error.
 * Go into Cpanel (if you use that) and check “Error Logs”
 * look for errors related to your wordpress installation. If you see any table 
   crashes, go into PHPmyadmin. Find the table that has crashed and repair it.
 * Sorry these instructions may be vague, but after I repaired the table that crashed,
   my problem went away. Phew!
 * Let me know if you need more detail. Not a techy myself, but i can kinda walk
   you through it.

Viewing 2 replies - 1 through 2 (of 2 total)

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## Tags

 * [Plugin activation error](https://wordpress.org/support/topic-tag/plugin-activation-error/)
 * [plugin-page](https://wordpress.org/support/topic-tag/plugin-page/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [cynthea](https://wordpress.org/support/users/cynthea/)
 * Last activity: [17 years, 2 months ago](https://wordpress.org/support/topic/plugin-activation-error-while-activating-my-plugins/#post-955726)
 * Status: not resolved

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