unfortunately your touch wizard has stopped

@Anton Berggren

If you have a Galaxy Tab 3 10.1 try starting the tablet in safe mode and then see if you can navigate to Settings > Applications > Application Manager > swipe right to the All screen > scroll down to find and tap Touchwiz > tap Clear cache > tap Clear data, then OK.

Note: All your Home screens will be deleted.

If no good, try wiping the cache partition and check if that resolves the problem.

If still no good try a factory reset using the hardware keys.

Be aware that a factory reset (aka hard reset) will erase all your user data and downloaded apps. It will restore the tablet to its’ factory default condition (or last system updated condition)