Title: Plugin activation causes HTTP 500 error
Last modified: October 10, 2017

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# Plugin activation causes HTTP 500 error

 *  [elmopienaar](https://wordpress.org/support/users/elmopienaar/)
 * (@elmopienaar)
 * [8 years, 7 months ago](https://wordpress.org/support/topic/plugin-activation-causes-http-500-error/)
 * Trying out some plugins and encountered server error 500
    From: 1) WP-Invoice:
   Business Locations (Usability Dynamics) [UD] 2) Snapshot Pro (WPMUDEV)
 * For both, the moment I activate it, it gives the error and shuts me out from 
   front/back end.
 * Discussing with Usability Dynamics, and them doing some troubleshooting they 
   gave the comments below. Also mentioned on the themes support forum (theme: UDesign)
   and Andon, the theme developer thought I might want to run it by wp-pagenavi 
   support. The theme requires to use wp-pagenavi.
 * Not quite sure how to proceed and whether wp-pagenavi commentnavi has anything
   to do with it as stated below. Reply from Usability Dynamics.
 * —
    “The issue is absolutely not related to our plugins. And it’s also not related
   to WP-Commentnavi plugin as well. But it’s related to condition which was added
   to incorrect place. [https://www.screencast.com/t/9LTPJcUtDMG](https://www.screencast.com/t/9LTPJcUtDMG)
   And now, instead of being called this condition ONLY on Front End ONLY for comments
   template. It’s being called on every page loading every time everywhere…. The
   solution for you: * Find and move condition to the correct place, as asked on
   WP-Commentnavi plugin’s overview page OR * Deactivate WP-Commentnavi plugin to
   prevent such cases NOT only for our WP-Invoice BL plugin but for other ones, 
   which are using `$wp_query`. —–
 * On my part; I haven’t changed anything.
    -  This topic was modified 8 years, 7 months ago by [elmopienaar](https://wordpress.org/support/users/elmopienaar/).
    -  This topic was modified 8 years, 7 months ago by [elmopienaar](https://wordpress.org/support/users/elmopienaar/).
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fplugin-activation-causes-http-500-error%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [Lester Chan](https://wordpress.org/support/users/gamerz/)
 * (@gamerz)
 * [8 years, 7 months ago](https://wordpress.org/support/topic/plugin-activation-causes-http-500-error/#post-9575155)
 * With regards to both WP-PaveNavi and WP-CommentNavi, both plugins need to be 
   placed in the correct place and that really differs from theme to theme. As all
   the theme comment section are coded differently, I can’t help you on this part.
   I provide the plugin as is, if you need help, you have to find your own developer.
 * What is the 500 server error? You need to check the logs.
    -  This reply was modified 8 years, 7 months ago by [Lester Chan](https://wordpress.org/support/users/gamerz/).

Viewing 1 replies (of 1 total)

The topic ‘Plugin activation causes HTTP 500 error’ is closed to new replies.

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 * 1 reply
 * 2 participants
 * Last reply from: [Lester Chan](https://wordpress.org/support/users/gamerz/)
 * Last activity: [8 years, 7 months ago](https://wordpress.org/support/topic/plugin-activation-causes-http-500-error/#post-9575155)
 * Status: not resolved