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In case you use a “child theme”, i would search also in the parent themes function.php @see https://codex.wordpress.org/Child_Themes
Okay, this is weird. I walked away for coffee, came back, and the error was gone. I was then presented with the WordPress login screen.
Well I did solve this. I have downgraded the wordpress version. I uploaded the old wp files to my server. Files should be rewritten ones in the server. Then I go back to website and upgrade it. Problem solved! This is my solution no other sugessions have worked for me. And the last warning DO … Read more
Plugin Installation Error
Neverending tag problem
I figured it out. I just needed to change the form method from get to post and I don’t have an error that I don’t have sufficient permissions anymore.
WordPress does not support MySQL 4 : To run WordPress your host just needs a couple of things: MySQL version 5.0 or greater (recommended: MySQL 5.5 or greater) https://wordpress.org/about/requirements/ While the utf8mb4 encoding is recent change and you might work around it, overall you still need compatible MySQL version.
Displaying errors on the front end from my plugin
It is a good practice (and suitable for production) to log the errors, instead (or in addition to) displaying them. See Configure Error Logging in Codex. I usually combine it with my Error Log Dashboard Widget plugin for bit of UI on live servers.