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释放。
有人可以帮忙吗？
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 核心基础 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 石英核心 0x0000000108f8108e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
20 石英核心 0x0000000108f80f0c _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
21 石英核心 0x0000000108f753c9 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 277
22 石英核心 0x0000000108fa3086 _ZN2CA11Transaction6commitEv + 486
23 石英核心 0x0000000108fb1b5c _ZN2CA7Display11DisplayLink14dispatch_itemsEyyy + 576
24 核心基础 0x000000010bcaf074 CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 20
25 核心基础 0x000000010bcaec21 __CFRunLoopDoTimer + 1089
26 核心基础 0x000000010bc70b11 __CFRunLoopRun + 1937
27 核心基础 0x000000010bc700f8 CFRunLoopRunSpecific + 488
28 图形服务 0x000000010df72ad2 GSEventRunModal + 161
29 UIKit 0x000000010945cf09 UIApplicationMain + 171
30 NewsHunt 0x0000000105763767 主要 + 151
31 libdyld.dylib 0x000000010cfeb92d 开始 + 1
32 ？？？0x0000000000000001 0x0 + 1
)