Title: fatal error
Last modified: August 19, 2016

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# fatal error

 *  [paulik](https://wordpress.org/support/users/paulik/)
 * (@paulik)
 * [15 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-242/)
 * I just downloaded multi-site manager plugin, after i activate it i got this message
 * Fatal error: Call to undefined function is_site_admin() in /home/understa/public_html/
   wp-content/plugins/yet-another-multi-site-manager/yet-another-multi-site-manager.
   php on line 662
 * On my site: [http://www.understanding-them.com](http://www.understanding-them.com)
 * Now i can’t log in to my site. I saw a similar problem with another site here
   on the forums, please i need help if anyone can?
    Thank you

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

 *  [Edward Caissie](https://wordpress.org/support/users/cais/)
 * (@cais)
 * [15 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-242/#post-1830430)
 * Using an FTP program you can manually delete the folder for the “Yet Another 
   Multi Site Manager” plugin; once deleted you should be able to log back into 
   your site.
 *  [serious6](https://wordpress.org/support/users/serious6/)
 * (@serious6)
 * [15 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-242/#post-1830431)
 * the plugin installed is compatible for Versions from 2.7 up to: 2.8.6!
    If you
   got the latest WordPress installed this could cause the error. If you can´t log
   in to deaktivate the plugin. Browse your site via ftp connection. Navigate to
   the plugins folder located in:
 * > root/wp-content/plugins/
 * and delete the complete pluginFolder of the plugin that you would like to be 
   deaktivated.

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

The topic ‘fatal error’ is closed to new replies.

 * 2 replies
 * 3 participants
 * Last reply from: [serious6](https://wordpress.org/support/users/serious6/)
 * Last activity: [15 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-242/#post-1830431)
 * Status: not resolved

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