PermissionsEx unable to load permissions backend

I have tried following other advice I have seen and tried fixing it, but I can't seem to get it to work. Before this, I was having trouble with prefixes too. Anybody good with this kind of thing able to help out?

pastebin of the permissions.yml for PermissionsEx- https://pastebin.com/Yq40D8RT
pastebin of the server log- https://pastebin.com/SAZa78pv