Title: Plugin activation causing Fatal Error msg
Last modified: October 15, 2022

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# Plugin activation causing Fatal Error msg

 *  Resolved [3ring](https://wordpress.org/support/users/3ring/)
 * (@3ring)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/plugin-activation-causing-fatal-error-msg/)
 * Hello, we’ve used your plugin successfully on our client’s website for a few 
   months – let’s call it “website-old.com”.
 * They just changed their main URL to reflect changes in company direction, let’s
   call it website-new.com.
 * We’ve migrated the entire site to the new domain with a new database name – just
   copied everything from the old database and renamed URL everywhere in the database.
   Everything is working fine EXCEPT the Accessibility Checker plugin.
 * When we try to activate the plugin we get a Fatal Error message:
 * > Plugin could not be activated because it triggered a fatal error.
   > Fatal error: Uncaught Error: Attempt to assign property “plugins” on bool in/
   > u/a/accountname/www.website-new.com/wp-content/plugins/accessibility-checker/
   > freemius/start.php:74 Stack trace: #0 /u/a/accountname/www.website-new.com/
   > wp-content/plugins/accessibility-checker/accessibility-checker.php(37): require_once()#
   > 1 /u/a/accountname/www.website-new.com/wp-content/plugins/accessibility-checker/
   > accessibility-checker.php(61): edac_fs() #2 /u/a/accountname/www.website-new.
   > com/wp-admin/includes/plugin.php(2313): include_once(‘…’) #3 /u/a/accountname/
   > www.website-new.com/wp-admin/plugins.php(192): plugin_sandbox_scrape() #4 {
   > main} thrown in /u/a/accountname/www.website-new.com/wp-content/plugins/accessibility-
   > checker/freemius/start.php on line 74
 * We tried deleting the plugin and reinstalling from the WP repository, but no 
   luck – same issue.
 * Please advise because we really like this plugin!

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

 *  Plugin Author [Steve Jones](https://wordpress.org/support/users/stevejonesdev/)
 * (@stevejonesdev)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-activation-causing-fatal-error-msg/#post-16150653)
 * This looks to be a conflict with another plugins Freemius cache. To fix this 
   you’ll need to install and run the Freemius Fixer plugin. The plugin and instructions
   can be found at the link below. I would suggest doing this on a staging or development
   environment first to ensure it works before doing it on your live website.
 * [https://github.com/Freemius/freemius-fixer](https://github.com/Freemius/freemius-fixer)
 * Thanks,
 * Steve
 *  Plugin Contributor [Amber Hinds](https://wordpress.org/support/users/alh0319/)
 * (@alh0319)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-activation-causing-fatal-error-msg/#post-16242846)
 * Hi [@3ring](https://wordpress.org/support/users/3ring/), we haven’t heard back
   from you so we’re going to mark this ticket as resolved. Hopefully the Freemius
   fixer worked for you. please let us know if not!

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

The topic ‘Plugin activation causing Fatal Error msg’ is closed to new replies.

 * ![](https://ps.w.org/accessibility-checker/assets/icon-256x256.png?rev=3094626)
 * [Equalize Digital Accessibility Checker - WCAG, ADA, EAA and Section 508 compliance](https://wordpress.org/plugins/accessibility-checker/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/accessibility-checker/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/accessibility-checker/)
 * [Active Topics](https://wordpress.org/support/plugin/accessibility-checker/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/accessibility-checker/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/accessibility-checker/reviews/)

## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)

 * 2 replies
 * 3 participants
 * Last reply from: [Amber Hinds](https://wordpress.org/support/users/alh0319/)
 * Last activity: [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-activation-causing-fatal-error-msg/#post-16242846)
 * Status: resolved