Did you get a recent update? Any changes since it worked? That typically means it doesn't have some sort of permission to access the data. Check the GSAM app's permission settings to see if something got toggled. All else fails, contact the Dev and give him details (phone, android version, version of gsam app in use, etc). The more detail you give, the better chance he'll help you..... he gets a ton of "My GSAM don't work, help" messages with zero information.