I was using the Add New Plugin function to install WordFence. It worked on all my other sites but for some reason, it crashed halfway and I think the installation got messed up.
I could no longer activate the plugin. So I deleted the plugin from my WordPress and tried again. Still no luck.
I went to phpmyadmin and removed all WordFence tables. Manually uploaded the plugin files via FTP and tried to activate it in WordPress. Still won't work.
Any ideas how to fix this problem?