There are tones of articles and video available to fix this Unfortunately Gallery has Stopped error for android phone and tablet, but the same solution not work for all, so here I will use easy ways to fix this unfortunately Gallery issue, I explain 2 to 3 method to fix this problem, hope one of them will fix your problem. In these methods data rarely delete but its better to take backup of your gallery and do this on your own risk.
1. First : go to phone “setting” tap on “app or app manager” go to “All” find “Gallery” and open it, tap on “Clear Data” “Clear Cache” and tap on “Force Stop”
2. Second: in All Apps find “Media Storage” “Clear Data” “Clear Cache” and reboot your device.
3. Third: Remove or Unmount external SD card or memory and use for a while to check whether it’s a memory problem, in some cases gallery crash because of bad memory data.
4. The last thing is “Wipe Cache Partition” if you don’t know how to do this than click HERE
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