Title: Plugin causes js error
Last modified: July 3, 2019

---

# Plugin causes js error

 *  [koepi](https://wordpress.org/support/users/koepi/)
 * (@koepi)
 * [6 years, 11 months ago](https://wordpress.org/support/topic/plugin-causes-js-error/)
 * Activating this plugin causes javascript error on wp backend ‘design –> themes.
   “
   $ is not a function” Your are not able to delete themes anymore.

Viewing 1 replies (of 1 total)

 *  Plugin Contributor [Matt Cromwell](https://wordpress.org/support/users/webdevmattcrom/)
 * (@webdevmattcrom)
 * [6 years, 11 months ago](https://wordpress.org/support/topic/plugin-causes-js-error/#post-11703589)
 * Hi there,
 * I can’t replicate that error at all, so this is most likely a unique combination
   with another plugin. I’d suggest using the Health Check plugin to troubleshoot
   that. It will allow you to deactivate all plugins and put your site on a default
   theme ONLY for yourself — your live visitors will not see that. We have a write-
   up on that here:
    [https://givewp.com/documentation/resources/troubleshoot-wordpress-websites-health-check/](https://givewp.com/documentation/resources/troubleshoot-wordpress-websites-health-check/)
 * Then you can enable plugins one at a time and test again until you see the problem
   again. Then let me know which plugin caused the conflict and I can take a closer
   look at replicating the issue for you.
 * Thanks!

Viewing 1 replies (of 1 total)

The topic ‘Plugin causes js error’ is closed to new replies.

 * ![](https://ps.w.org/wp-rollback/assets/icon-256x256.jpg?rev=3014868)
 * [WP Rollback - Rollback Plugins and Themes](https://wordpress.org/plugins/wp-rollback/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-rollback/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-rollback/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-rollback/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-rollback/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-rollback/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [Matt Cromwell](https://wordpress.org/support/users/webdevmattcrom/)
 * Last activity: [6 years, 11 months ago](https://wordpress.org/support/topic/plugin-causes-js-error/#post-11703589)
 * Status: not resolved