Posting this in case anyone else runs into it. It was driving me nuts earlier today.
You’re probably getting this because you’re running WP from a virtual directory or an apache alias (for example, I’m running WAMP and my WP is installed at localhost/wordpress/).
There are several places in the code where things are referenced off the root, so the app is looking for /wp-admin/blahblahblah instead of /wordpress/wp-admin/blahblahblah.
Here are the places I changed that and I quit getting hung up –
project-tasks-form.php line 131
project-tasks.css lines 74 and 196
project-tasks.js line 89