Don't think we can help on the forum with this. You can wait some time and try it again. But if this is not helping and the logs are not showing anything you can better contact the mendix support.
I have same experience, when i look in the build log is seems to be ok but the build did states falied in Studio Pro… I just redeploy but this is an issue...
Are you using a free app or licenced node?
It is a free app. Does it mean that I have crossed the maximum number of objects allowed in a free app?
Thanks a lot for your comments. I check the build-log and found it failed due to one of the java components. I had removed the java component few days ago but surprisingly it was still present in the project’s javasource folder. I removed it from there also and that resolved the issue. Thanks again.