iOS MoPub native ads with custom network - autolayout engine exception

[guybashan]

I am trying to make MoPub native ads to work on example demo app (using Swift).
I am getting the following exception when table it trying to load native ads:

2017-03-24 18:02:57.095 mopub-native-adapter[31020:844300] MOPUB: Successfully loaded native ad.
2017-03-24 18:02:57.143 mopub-native-adapter[31020:844300] This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.
Stack:(
0 CoreFoundation 0x04137bf2 __exceptionPreprocess + 194
1 libobjc.A.dylib 0x038c5e66 objc_exception_throw + 52
2 CoreFoundation 0x041a9f85 +[NSException raise:format:] + 133
3 Foundation 0x00fcbf61 _AssertAutolayoutOnAllowedThreadsOnly + 197
4 Foundation 0x00ddd876 -[NSISEngine withBehaviors:performModifications:] + 28
5 Foundation 0x00ddd855 -[NSISEngine withAutomaticOptimizationDisabled:] + 31
6 UIKit 0x01bca2cb -[UIView(Hierarchy) _postMovedFromSuperview:] + 880
7 UIKit 0x01bdb5f0 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 2318
8 UIKit 0x01bc7d64 -[UIView(Hierarchy) insertSubview:atIndex:] + 47
9 UIKit 0x01c7030d -[UITableView _addContentSubview:atBack:] + 390
10 UIKit 0x01c9282d __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 3151
11 UIKit 0x01bd30e9 +[UIView(Animation) performWithoutAnimation:] + 102
12 UIKit 0x01bd3133 +[UIView(Animation) _performWithoutAnimation:] + 32
13 UIKit 0x01c91bc5 -[UITableView _configureCellForDisplay:forIndexPath:] + 506
14 UIKit 0x01c89b94 -[UITableView dequeueReusableCellWithIdentifier:forIndexPath:] + 446
15 mopub-native-adapter 0x0018694b -[MPTableViewAdPlacer tableView:cellForRowAtIndexPath:] + 219
16 UIKit 0x01c9e408 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 772
17 UIKit 0x01c9e6d0 -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 92
18 UIKit 0x0201a6ca -[_UITableViewUpdateSupport(Private) _setupAnimationsForNewlyInsertedCells] + 8260
19 UIKit 0x02024edd -[_UITableViewUpdateSupport _setupAnimations] + 265
20 UIKit 0x01c73f5d -[UITableView _updateWithItems:updateSupport:] + 3123
21 UIKit 0x01c6c01d -[UITableView _endCellAnimationsWithContext:] + 18826
22 UIKit 0x01c84b05 -[UITableView endUpdatesWithContext:] + 49
23 UIKit 0x01c84b29 -[UITableView endUpdates] + 31
24 mopub-native-adapter 0x0018b61d -[UITableView(MPTableViewAdPlacer) mp_endUpdates] + 45
25 mopub-native-adapter 0x00186082 -[MPTableViewAdPlacer adPlacer:didLoadAdAtIndexPath:] + 674
26 mopub-native-adapter 0x00183eb6 -[MPStreamAdPlacer fillAdsInConsideredRange] + 726
27 mopub-native-adapter 0x00183ffe -[MPStreamAdPlacer adSourceDidFinishRequest:] + 78
28 mopub-native-adapter 0x0015de37 -[MPNativeAdSource adSourceQueueAdIsAvailable:] + 119
29 mopub-native-adapter 0x0015ead0 __39-[MPNativeAdSourceQueue replenishCache]_block_invoke + 384
30 mopub-native-adapter 0x0015af77 _45-[MPNativeAdRequest assignCompletionHandler:]block_invoke + 151
31 mopub-native-adapter 0x0015c1d2 -[MPNativeAdRequest completeAdRequestWithAdObject:error:] + 626
32 mopub-native-adapter 0x0015c95e -[MPNativeAdRequest nativeCustomEvent:didLoadAd:] + 990
33 mopub-native-adapter 0x000db8b9 TFFC20mopub_native_adapter24YouAppiNativeCustomEvent9requestAdFT19withCustomEventInfoGSQGVs10DictionaryVs11AnyHashableP____T_U_FGSqCS_7AdModel_T + 457
34 mopub-native-adapter 0x000dba3b TPA__TFFC20mopub_native_adapter24YouAppiNativeCustomEvent9requestAdFT19withCustomEventInfoGSQGVs10DictionaryVs11AnyHashableP____T_U_FGSqCS_7AdModel_T + 91
35 mopub-native-adapter 0x000e8db0 TFFC20mopub_native_adapter15YouAppiNativeAd6loadAdFT10onAdLoadedFGSqCS_7AdModel_T_9onAdErrorFGSqPs5Error__T__T_U_FTGSqV10Foundation4Data_GSqCSo11URLResponse_GSqPS2____T + 1888
36 mopub-native-adapter 0x000e96e7 TPA__TFFC20mopub_native_adapter15YouAppiNativeAd6loadAdFT10onAdLoadedFGSqCS_7AdModel_T_9onAdErrorFGSqPs5Error__T__T_U_FTGSqV10Foundation4Data_GSqCSo11URLResponse_GSqPS2____T + 135
37 mopub-native-adapter 0x000e8fde TTRXFo_oGSqV10Foundation4Data_oGSqCSo11URLResponse_oGSqPs5Error____XFdCb_dGSqCSo6NSData_dGSqS1__dGSqCSo7NSError + 206
38 CFNetwork 0x05053176 __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 33
39 CFNetwork 0x050529c0 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 333
40 Foundation 0x00dc3f8b NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK + 12
41 Foundation 0x00dc3c5e -[NSBlockOperation main] + 105
42 Foundation 0x00dc2436 -[__NSOperationInternal _start:] + 672
43 Foundation 0x00dc218e -[NSOperation start] + 70
44 Foundation 0x00dbe23e __NSOQSchedule_f + 220
45 libdispatch.dylib 0x05ad3cc3 _dispatch_client_callout + 14
46 libdispatch.dylib 0x05ab03ae _dispatch_queue_serial_drain + 1619
47 libdispatch.dylib 0x05ab0bc2 _dispatch_queue_invoke + 1109
48 libdispatch.dylib 0x05ab35e4 _dispatch_root_queue_drain + 470
49 libdispatch.dylib 0x05ab33a6 _dispatch_worker_thread3 + 143
50 libsystem_pthread.dylib 0x05e4fd3e _pthread_wqthread + 1070
51 libsystem_pthread.dylib 0x05e4f8ea start_wqthread + 34
)

Anything I am missing?

[Pooja]

Hi @guybashan,

Thank you for reaching out to our forum.

While we review your logs, can you please help us understand your implementation in detail? How are you building the tableview, can you brief us through the implementation/ sequence of steps followed? Also will you be able to share us your Xcode logs?

Thank you,
Pooja

[guybashan]

Hi Pooja,

I pretty much resolve all the issues I had with the adapter (native ads
adapter for iOS).

It was pretty hard, since there is no example for Swift…

Thanks,

Guy

[Pooja]

Hi @guybashan,

Good to know that the issues are resolved.

We will definitely check with our engineering team on the swift sample, in the meantime if you notice any other issues please let us know.

Thank you,
Pooja