Frequently, the Bravo printer is not able to communicate to programs such as Sure Thing.
There could be many reasons, but here are the most common steps to resolve the problem.
1. Stuck print job - clear the print queue, then reboot the Bravo
2. Corrupted driver - reinstall
3. Corrupted mapped drive on Windows - change drive letter
4. Bad USB port or cable - always a possibility, but not usually the first thing to try
Here is the go to support document from Bravo: