Hi,
This seems to be a problem caused by the plugin Mini Go.
I deactivate all plugins and activated the Swiftframework plugin without any problem.
When I activated the Mini Go plugin it crashed with that error message in line 4. That plugin must be changing something in the filepath that is causing some issue.
I can’t access the site now since it’s with that error. Try to remove that plugin from the plugins directory and test again.
-Rui