ios - GameCenter Leaderboard in SpriteKit causing error -

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i finished game in sprite kit , trying store highscore in gamecenter's leaderboards. followed tutorials worked great none-spritekit-projects. steps error:

  1. i debug app without errors, warnings no harm.
  2. app runs great, , starting skactions work flawless.
  3. i log in gamecenter succesfully.
  4. when touch screen freezes , gives me "missed method" log error , "thread 1:exc_bad_access (code=1, address=0x80000012)". whenever delete line of code causing bad_acess error pops other place in code.

my log:

 2014-04-21 19:51:26.893 sharky[3417:60b] missed method 2014-04-21 19:51:27.683 sharky[3417:60b] -[nsmethodsignature copywithzone:]: unrecognized selector sent instance 0xacbdc20 2014-04-21 19:51:27.685 sharky[3417:60b] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[nsmethodsignature copywithzone:]: unrecognized selector sent instance 0xacbdc20' *** first throw call stack: (     0   corefoundation                      0x0009c1e4 __exceptionpreprocess + 180     1   libobjc.a.dylib                     0x019978e5 objc_exception_throw + 44     2   corefoundation                      0x00139243 -[nsobject(nsobject) doesnotrecognizeselector:] + 275     3   corefoundation                      0x0008c50b ___forwarding___ + 1019     4   corefoundation                      0x0008c0ee _cf_forwarding_prep_0 + 14     5   libobjc.a.dylib                     0x019a9bcd -[nsobject copy] + 41     6   spritekit                           0x01481f4c -[sknode runaction:] + 55     7   sharky                              0x0000595c -[myscene touchesbegan:withevent:] + 476     8   spritekit                           0x014702bf -[skview touchesbegan:withevent:] + 824     9   uikit                               0x00576c0b -[uiwindow _sendtouchesforevent:] + 386     10  uikit                               0x005779d1 -[uiwindow sendevent:] + 1117     11  uikit                               0x005495f2 -[uiapplication sendevent:] + 242     12  uikit                               0x00533353 _uiapplicationhandleeventqueue + 11455     13  corefoundation                      0x0002577f __cfrunloop_is_calling_out_to_a_source0_perform_function__ + 15     14  corefoundation                      0x0002510b __cfrunloopdosources0 + 235     15  corefoundation                      0x000421ae __cfrunlooprun + 910     16  corefoundation                      0x000419d3 cfrunlooprunspecific + 467     17  corefoundation                      0x000417eb cfrunloopruninmode + 123     18  graphicsservices                    0x03a7f5ee gseventrunmodal + 192     19  graphicsservices                    0x03a7f42b gseventrun + 104     20  uikit                               0x00535f9b uiapplicationmain + 1225     21  sharky                              0x0000a472 main + 130     22  libdyld.dylib                       0x023e4701 start + 1     23  ???                                 0x00000001 0x0 + 1 ) libc++abi.dylib: terminating uncaught exception of type nsexception (lldb)

does have clue whats going on? or have step-by-step tutorial on how integrate gamecenter leaderboards sprite kit project?


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