Last Exception Backtrace:
0   CoreFoundation                	0x1879e659c __exceptionPreprocess + 132
1   libobjc.A.dylib               	0x1981380e4 objc_exception_throw + 60
2   CoreFoundation                	0x1879e64dc +[NSException raise:format:] + 128
3   GameCenterFoundation          	0x1903cc6c4 +[GKScore reportScores:whileScreeningChallenges:withEligibleChallenges:withCompletionHandler:] + 392
4   Kvisko                        	0x10003a074 0x100008000 + 204916
5   Kvisko                        	0x100036824 0x100008000 + 190500
6   libdispatch.dylib             	0x19877d3ac _dispatch_call_block_and_release + 24
7   libdispatch.dylib             	0x19877d36c _dispatch_client_callout + 16
8   libdispatch.dylib             	0x198781980 _dispatch_main_queue_callback_4CF + 932
9   CoreFoundation                	0x18799dfa4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
10  CoreFoundation                	0x18799c04c __CFRunLoopRun + 1492
11  CoreFoundation                	0x1878c90a4 CFRunLoopRunSpecific + 396
12  GraphicsServices              	0x190a635a4 GSEventRunModal + 168
13  UIKit                         	0x18c1faaa4 UIApplicationMain + 1488
14  Kvisko                        	0x1000112ec 0x100008000 + 37612
15  libdyld.dylib                 	0x1987a6a08 start + 4