I want to help, but my english is not good.
For me the problem was the plugin “Instagram for WordPress” & “AppStore Links”.
You can open the file wpinstagram.php in Instagram plugin and search the string
“function admin_register_head” &
“add_action (‘admin_head’, ‘admin_register_head’);“.
I simply added a “_a” to both strings.
“function admin_register_head_a” &
“add_action (‘admin_head’, ‘admin_register_head_a’);“
So it works for me again. No guarantee.
thanks and regards
I solved the problem.
Looking at one of the plugins the code “function admin_register_head” and add code with characters, such as “function admin_register_head_a“.
Also code “add_action (‘admin_head’, ‘admin_register_head_a‘);” complement with the same characters.
Now the plugin can be activated without any problems.
Thanks
