Added the app, without data, without sheets. When I import this app to the server, change the load script and try to save, I get the error.
At this point I'm assuming it's a bug.
Engine Problems.qvf 233.0 K
From my experience, if you have this error when accessing the server hub, that is because the server name has not been added into the white list.
If this only happens to one app, I would be interested to know which Sense version you are using.
Both the versions for June 2017 patch 2 and the September 2017 say that they have fixed this bug: