I can’t log out

Hi there, I have a problem with logging out. When I want to log out I get a message:

Can’t load wp-config.php (located in “/directories-and-stuff/wptest/wp-content”). You must put this plugin in your plugins directory (“/wordpress/wp-content/plugins/”).

So it says wp-config.php is in “wptest” but should be in “wordpress”. But “wordpress” is a directory on my own computer (localhost). Anybody know where this error is located and/or what I should do.

Thanks in advance.