Everytime you build your app through Monaca IDE, Monaca saves your build history where you can see your build detail and error logs.
You can view your build history as following:
From the Monaca Cloud IDE menu, go to Build → Build History .
Your built history will be displayed as following.
Click on Delete button to remove particular item from your history or Download button to download the built app. Once an item is removed, it cannot be undone.