Same thing happened to me just 10 minutes after trying my phone for the first time! haha.

Got the same error as you. What i did was to plug the device into my pc and choose the mass storage setting. Then i just formatted the 32gb partition via my computer. Now be sure to backup anything u got stored in there, like the default pictures, videoes and so on.

Worked like a charm, and the camera once again worked.
What caused the issue for me was corrupted files after a failed copy from pc to device.

Regards!