Working directory not working

OK, this is just when I least need it–a wordpress breakdown; or whatever you want to call it. I’ve been running WordPress for a few months, and it has worked beautifully–until now.

I was trying to enable a plugin, and it gave out a php error:
/usr/local/apache2/htdocs/joetheprogrammer/wordpress/wp-content/plugins/exhibit10.php

I know exactly why it gave this error, it’s because the working directories are messed up. Now when I try to view any page on my site, including wordpress admin page, it gives out similar errors when I try to view them.

My site is https://dhost.info/joetheprogrammer/wordpress/, you can visit it if you want to know what I mean.

It’s probably because the extension set the working directory, expecting that the server would be a self-hosted one. But how do I set it back to the way it was before, especially when I can’t access my admin page. It will probably involve going into the sql tables, but I’m fairly comfortable with that.