Error when activating any plugin

[ivanbayross]

Hi, Whenever we activate any newly installed plugin, we always receive the following errors: Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /xxxx/xxxx/xxxx/wp-includes/plugin.php on line 235 Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /xxxx/xxxx/xxxx/wp-includes/plugin.php on line 235 Warning: Cannot modify header information - headers already sent by (output started at /xxxx/xxxx/xxxx/wp-includes/plugin.php:235) in /xxxx/xxxx/xxxx/wp-includes/pluggable.php on line 1228 Warning: Cannot modify header information - headers already sent by (output started at /xxxx/xxxx/xxxx/wp-includes/plugin.php:235) in /xxxx/xxxx/xxxx/wp-includes/pluggable.php on line 1228 Any ideas as to why this is happening. Before we never faced any issues with adding and activating WP Plugins. Any help will be appreciated. Regards,

[Anshuman Sahu]

It may be appearing due to you may have added a custom code in a wrong file . Please check your customizations for this . Also there maybe a third party plugin responsible for this please try deactivating it .

[ivanbayross]

Hi, We have installed two WPLMS theme. One is the parent WPLMS. The second one is WPLMS Blank ChildTheme. We have activated the child theme. Any CSS customisation we want we have it to the WPLMS Blank ChildTheme CSS file via FTP. Other then that we have not made any customizations. We deactivated all plugins and then started re-activating one by one to check if the error comes again. We could not get the error again. These are the list of plugins we are using:

1. BuddyPress
2. Vibe Course Module
3. Vibe Custom Types
4. WPLMS Front End
5. WPLMS Customizer Plugin
6. Vibe ShortCodes
7. bbPress
8. LayerSlider WP
9. WooCommerce
10. WPLMS EventOn
11. WPLMS Dashboard
12. EventON
13. WPLMS Assignments
14. WPBakery Visual Composer
15. Akismet
16. CommentLuv Premium
17. Formidable
18. UpdraftPlus - Backup/Restore
19. Ultimate Addons for Visual Composer
20. Simple Page Ordering
21. Layered Popups
22. NextScripts: Social Networks Auto-Poster
23. NextScripts: SNAP Pro Upgrade Helper
24. Wordfence Security
25. W3 Total Cache
26. Remove Widget Titles
27. Code Snippets
28. Duplicate Post
29. Yoast SEO

Do you have any idea if any of the above plugins may cause issues?    

[Anshuman Sahu]

This can be a plugin conflict .Please check if the error appears again .

[mucklepaws]

Hi, I cant even get the plugins installed. I just get "Download failed. Unauthorized" Whats the deal with that? Its on others but this is <h1>Vibe Course Module</h1>

[Anshuman Sahu]

Our update api was down .It will be fixed soon . Please try updating try updating the vibe course module plugin again  .

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