Run locally and see if it runs without any errors?
Check your latest build output. Open app in developer portal, go to environments in deploy section and see latest build output there. Check any errors in the logs there?
I have similar problems.
Locally builds ok, remotely I get this:
There is currently some issue with Mendix deployment services. You can see the incident regarding failing deployment reported at Mendix status site here. https://status.mendix.com/
Meanwhile you may try deploying 3-4 times and see if it succeeds. Sometimes it randomly fails for me too.