The problem first :
Galaxy SII getting Unknown error by ErrorCallback Flash does not appear to work.
The problem second :
Samsung galaxy s2 goes black. Unable to take photos
Now the solution to all these problems
Step 1 : Go to Settings
Step 2 : Select Applications ->Manage Applications or Apps
Step 3 : Select All (Look for ALL on top menu or swipe to the right to get to ALL)
Step 4 : Select Camera. Select Force Stop and Clear...
