崩溃日志在这里： -
我们只是从Facebook Audience Network获取广告并在列表视图中显示。
我们正在使用来自XIB的FBMedia视图，如Facebook Audience Network示例应用程序所示。不知何故，AVplayer在移除观察者之前被解除分配。
有人可以帮忙解决这个问题。
2016-07-19 16:22:02.905 NewsHunt[59124:1425162] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An instance of AVPlayer cannot remove a time observer that was added by a different instance of AVPlayer.'
***首先抛出调用堆栈：
（
0 CoreFoundation 0x000000010bd55d85 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010b7c9deb objc_exception_throw + 48
2 AVFoundation 0x0000000106c25ee7 - [AVPlayer _removeAllLayers] + 0
3 NewsHunt 0x0000000105c2d721 - [FBAdVideoView removeAllTimingObservers] + 369
4 NewsHunt 0x0000000105c2b167 - [FBAdVideoView playMovieWithURL：withVideoPlayCheck：withVideoTimeCheck：withFailure：] + 183
5 NewsHunt 0x0000000105c5b8df - [FBMediaView loadVideo] + 671
6 NewsHunt 0x0000000105c5b045 - [FBMediaView loadNativeAd：] + 389
7 NewsHunt 0x0000000105c5ae8f - [FBMediaView setNativeAd：] + 431
8 NewsHunt 0x00000001056c0180 - [DHFANAdCommunicator renderAdOnView：andParentViewController：] + 240
9 NewsHunt 0x00000001055e1f8c - [DHMultipleExternalAdResponse renderAdOnView：andParentViewController：] + 124
10 NewsHunt 0x00000001056c3baf - [DHCardP1AdRenderer setAd：onView：] + 143
11 NewsHunt 0x0000000105850113 - [NewsListViewController tableView：willDisplayCell：forRowAtIndexPath：] + 467
12 UIKit 0x00000001095ba59c - [UITableView _createPreparedCellForGlobalRow：withIndexPath：willDisplay：] + 934
13 UIKit 0x00000001095ba62c - [UITableView _createPreparedCellForGlobalRow：willDisplay：] + 74
14 UIKit 0x000000010958ed4f - [UITableView _updateVisibleCellsNow：isRecursive：] + 2996
15 UIKit 0x00000001095c3686 - [UITableView _performWithCachedTraitCollection：] + 92
16 UIKit 0x00000001095aa344 - [UITableView layoutSubviews] + 224
17 UIKit 0x0000000109517980 - [UIView（CALayerDelegate）layoutSublayersOfLayer：] + 703
18 QuartzCore 0x0000000108f8cc00 - [CALayer layoutSublayers] + 146
19 QuartzCore 0x0000000108f8108e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
20 QuartzCore 0x0000000108f80f0c _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
21 QuartzCore 0x0000000108f753c9 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 277
22 QuartzCore 0x0000000108fa3086 _ZN2CA11Transaction6commitEv + 486
23 QuartzCore 0x0000000108fb1b5c _ZN2CA7Display11DisplayLink14dispatch_itemsEyyy + 576
24 CoreFoundation 0x000000010bcaf074 CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 20
25 CoreFoundation 0x000000010bcaec21 __CFRunLoopDoTimer + 1089
26 CoreFoundation 0x000000010bc70b11 __CFRunLoopRun + 1937
27 CoreFoundation 0x000000010bc700f8 CFRunLoopRunSpecific + 488
28 GraphicsServices 0x000000010df72ad2 GSEventRunModal + 161
29 UIKit 0x000000010945cf09 UIApplicationMain + 171
30 NewsHunt 0x0000000105763767 main + 151
31 libdyld.dylib 0x000000010cfeb92d start + 1
32 ??? 0x0000000000000001 0x0 + 1
）