I need more details to help you out here. It might be that your definition takes too long to process and hits your computation time limit. Try to narrow down the problem and share a minimal definition replicating the issue so we can have a closer look.
Also, ShapeDiver sends automated emails when a definition is rejected on upload, please check your inbox for more information.
Following resources can give you a better idea how to successfuly upload models to ShapeDiver.