Notice: register_uninstall_hook was called incorrectly

I automatically updated my wordpress installation to the latest version. Everything looked normal unit "updating database..." where it got stuck. I waited for a long while and then closed the page, since nothing was happening.

Then I got a error message saying something about maintenance, which I got rid of after deleting the maintenance file.

Wordpress displays that it runs the latest version, but when I try to reinstall I get the same errror. I've tried disabling all plugins and switch to the default theme, but no luck.

I set the debug to true and I got this message: Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information.

Everything looks normal except a image on the front page is breaking the layout. Any tips?

Solutions

Some WordPress Plugin which you have installed is firing the uninstall hook and is not setup properly.

Can you find the path to the file from the error message?

The way I fixed this type of problem, was to do a global search in my project for the function call.

Some plugins had been installed which had calls such as this: 

register_uninstall_hook(__FILE__, array($this,'uninstall_removedata'));

but it should be this: 

register_uninstall_hook( __FILE__, 'uninstall_removedata');

If you see a message that something is called incorrectly, the Codex can be very helpful to make sure you use the correct syntax.

In this case it is here: http://codex.wordpress.org/Function_Reference/register_uninstall_hook

Tags: Wordpress / Debugging

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