2011-09-06 10:45:32.344 zjjt[1627:5f03] *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <CALayerArray: 0xb226f50> was mutated while being enumerated.(
"<CALayer: 0x6036f40>",
"<CALayer: 0x603ab80>",
"<CALayer: 0x60179d0>",
"<CALayer: 0x602e030>",
"<CALayer: 0x601a3a0>",
"<CALayer: 0x6033f60>",
"<CALayer: 0x603b660>",
"<CALayer: 0xb22a550>",
"<CALayer: 0x6017b50>",
"<CALayer: 0x6228670>",
"<CALayer: 0xb222340>",
"<CALayer: 0x6039a20>",
"<CALayer: 0x6040900>",
"<CALayer: 0xb2223e0>",
"<CALayer: 0x603cc00>",
"<CALayer: 0x6036cf0>",
"<CALayer: 0x6039540>",
"<CALayer: 0x603b260>",
"<CALayer: 0x6038b50>",
"<CALayer: 0x6040430>"
)'
*** Call stack at first throw:
(
0 CoreFoundation 0x01b7a5a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x01cce313 objc_exception_throw + 44
2 CoreFoundation 0x01b7a069 __NSFastEnumerationMutationHandler + 377
3 UIKit 0x00bfc75c -[UIView(Hierarchy) subviews] + 331
4 zjjt 0x0007a0ef -[AGSTiledLayerView mapZoomed:] + 546
5 zjjt 0x00079ec6 -[AGSTiledLayerView mapIsZooming:] + 116
6 zjjt 0x0006f67e -[AGSMapView kickOffMapIsZooming:] + 321
7 Foundation 0x0094294e __NSThreadPerformPerform + 251
8 CoreFoundation 0x01b5b8ff __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
9 CoreFoundation 0x01ab988b __CFRunLoopDoSources0 + 571
10 CoreFoundation 0x01ab8d86 __CFRunLoopRun + 470
11 CoreFoundation 0x01ab8840 CFRunLoopRunSpecific + 208
12 CoreFoundation 0x01ab8761 CFRunLoopRunInMode + 97
13 Foundation 0x00964115 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 295
14 zjjt 0x000625c0 -[WorkerThreadUnit workerThreadMainRoutine] + 166
15 Foundation 0x0092dcf4 -[NSThread main] + 81
16 Foundation 0x0092dc80 __NSThread__main__ + 1387
17 libSystem.B.dylib 0x98261819 _pthread_start + 345
18 libSystem.B.dylib 0x9826169e thread_start + 34
)
how??