Editor Error "Assertion failed 'Thread::CurrentThreadIsMainThread("on upgrade to unity2017

i upgrade unity to 2017.1.1p3 from unity 5.6
have error but it not have in unity 5.6
and this error only happened when use AssetBundle
Please help! (。・д・。) !
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Assertion failed: Assertion failed on expression: 'Thread::CurrentThreadIsMainThread()'
0x000000014099240B (Unity) StackWalker::GetCurrentCallstack
0x000000014099592F (Unity) StackWalker::ShowCallstack
0x0000000140D3C510 (Unity) GetStacktrace
0x0000000141082A16 (Unity) DebugStringToFile
0x00000001410831EC (Unity) DebugStringToFile
0x0000000140ACE9DF (Unity) AnimationClip::BuildMecanimDataMainThread
0x0000000140ACFBE3 (Unity) AnimationClip::Transfer<StreamedBinaryRead<0> >
0x0000000140AD655D (Unity) AnimationClip::VirtualRedirectTransfer
0x0000000141436048 (Unity) SerializedFile::ReadObject
0x00000001414416CF (Unity) PersistentManager::ReadAndActivateObjectThreaded
0x00000001414431C4 (Unity) PersistentManager::LoadFileCompletelyThreaded
0x00000001413D4FD7 (Unity) LoadSceneOperation::Perform
0x00000001413D4640 (Unity) PreloadManager::ProcessSingleOperation
0x00000001413D47AD (Unity) PreloadManager::Run
0x00000001413D53C7 (Unity) PreloadManager::Run
0x00000001415B80FC (Unity) Thread::RunThreadWrapper
0x00007FFF682C2774 (KERNEL32) BaseThreadInitThunk
0x00007FFF6AC40D51 (ntdll) RtlUserThreadStart


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maybe related.