For some features such as opening chests, Mr Autofire requires your device time to be in sync with the server time.
Setting your device time to automatic should solve this problem.
I have an Android device.
- Go to Settings -> Date & time
- Find Automatic date & time and enable it.
- Find Automatic time zone and enable it.
I have an Apple device.
- Go to Settings -> General -> Data & Time
- Enable "Set Automatically"