I did some more troubleshooting and here’s what I’ve figured out so far:
If I switch back to a generic theme and click into a post while logged in I can see the edit button and edit/delete the post from there. Once I delete a post it brings me back to the “All Posts” page, but if I tried to manually navigate to the “All Posts” page it gives me the error message again.
There must be a way to fix this so I don’t have to use this silly work-around! Please help!