# UE4 Crashes due to FMODAmbient hot reload **URL:** \ **Category:** Unreal Engine\ **Created:** [July 11, 2018, 12:45pm UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992 "2018-07-11T12:45:34Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![jakelong](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@jakelong](https://qa.fmod.com/u/jakelong)\ **Post date:** [July 11, 2018, 12:45pm UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/1 "2018-07-11T12:45:34Z")
Hello guys, recently I encountered a really weird problem that I dont know how to fix it ☹ I’m using UE 4.17.2 and the latest FMOD Integration for it. Everything works fine, event is played, I have packaged the games a couple of times and no problems found. But then just lately, I usually get engine crashes after compiling the game codes for a couple of times. After the crash, restarting the engine and this is the error : /////////////////////////////////////////////////////////////////////////////// Assertion failed: GIsHotReload [File:D:\Build++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectBase.cpp] [Line: 608] Trying to recreate class ‘AFMODAmbientSound’ outside of hot reload! UE4Editor\_CoreUObject!UObject::ConditionalBeginDestroy() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:878] UE4Editor\_CoreUObject!StaticExit() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:4194] UE4Editor\_CoreUObject!TBaseStaticDelegateInstance\::ExecuteIfSafe() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:1027] UE4Editor!TBaseMulticastDelegate::Broadcast() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:937] UE4Editor!FEngineLoop::AppPreExit() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3858] UE4Editor!FEngineLoop::Exit() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2808] UE4Editor!GuardedMain() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\launch.cpp:177] UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134] UE4Editor!WinMain() [d:\build++ue4+release-4.17+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210] UE4Editor!\_\_scrt\_common\_main\_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe\_common.inl:253] /////////////////////////////////////////////////////////////////////////////// Before this message pops up, it said that my game module cannot be loaded. This error is fixed by recompiling the game code. Also I dont use any FMODAmbientSound in the game. Please help me ☹ I’m really desperate right now. Thank you guys ---
**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\ **Post date:** [July 16, 2018, 1:43am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/2 "2018-07-16T01:43:31Z")
I’m not sure what would cause this to happen, but it sounds like the crash left the game in a bad state. Do you know the cause of the crash? Did the crash logs mention anything about FMOD? This page can tell you where to find them: [https://wiki.unrealengine.com/Locating\_Project\_Logs#Crash\_Logs](https://wiki.unrealengine.com/Locating_Project_Logs#Crash_Logs) ---
**Author:** ![jakelong](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@jakelong](https://qa.fmod.com/u/jakelong)\ **Post date:** [July 16, 2018, 1:50am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/3 "2018-07-16T01:50:57Z")
Yes it did. It said AFMODAmbientSound cannot be created outside hot reload even though I dont even use fmodambiensound ---
**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\ **Post date:** [July 16, 2018, 2:00am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/4 "2018-07-16T02:00:02Z")
> [@](#): > > Yes it did. It said AFMODAmbientSound cannot be created outside hot reload even though I dont even use fmodambiensound Are you able to send us the crash log? You can email it if you would like: [support@fmod.com](mailto:support@fmod.com) ---
**Author:** ![jakelong](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@jakelong](https://qa.fmod.com/u/jakelong)\ **Post date:** [July 16, 2018, 2:24am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/5 "2018-07-16T02:24:31Z")
I just uploaded to 4.19.2 and this problem seems to be gone. I believe this issue belongs to the engine hot reload itself rather than fmod. But I still sometimes receive the error that the UE4Editor-FMODStudio.dll hasnt been built and I need to rebuild it in order to open the engine ---
**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\ **Post date:** [July 18, 2018, 2:57am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/6 "2018-07-18T02:57:59Z")
This usually occurs when the plugin source code is modified, because the UE4-FMOD libs are now out of date. Are you using source control at all? ---
**Author:** ![scholzi](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/scholzi/32/2042_2.png) [@scholzi](https://qa.fmod.com/u/scholzi)\ **Post date:** [May 3, 2021, 9:04pm UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/7 "2021-05-03T21:04:12Z")
This is happening to me in UE 4.26 with FMod 2.01.09 and I am using GIt for my project ---
**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\ **Post date:** [May 7, 2021, 6:32am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/8 "2021-05-07T06:32:09Z")
Are you able to share your output log file at all? ---
**Author:** ![kain0024](https://avatars.discourse-cdn.com/v4/letter/k/7ba0ec/32.png) [@kain0024](https://qa.fmod.com/u/kain0024)\ **Post date:** [June 30, 2021, 7:49am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/9 "2021-06-30T07:49:55Z")
I am using UE 4.26.2 engine source from git with FMod 2.01.05. ## Below is the call stack. hope you can solve it. | \> | UE4Editor-CoreUObject-Win64-Debug.dll!UObject::EnsureNotRetrievingVTablePtr() 줄 106 | C++ | | --- | --- | --- | | | UE4Editor-CoreUObject-Win64-Debug.dll!UObject::UObject(const FObjectInitializer & ObjectInitializer) 줄 2581 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!UStruct::UStruct(const FObjectInitializer & ObjectInitializer, UStruct \* InSuperStruct, unsigned \_\_int64 ParamsSize, unsigned \_\_int64 Alignment) 줄 673 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!UFunction::UFunction(const FObjectInitializer & ObjectInitializer, UFunction \* InSuperFunction, EFunctionFlags InFunctionFlags, unsigned \_\_int64 ParamsSize) 줄 5532 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!UDelegateFunction::UDelegateFunction(const FObjectInitializer & ObjectInitializer, UFunction \* InSuperFunction, EFunctionFlags InFunctionFlags, unsigned \_\_int64 ParamsSize) 줄 6024 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!UE4CodeGen\_Private::ConstructUFunction(UFunction \* & OutFunction, const UE4CodeGen\_Private::FFunctionParams & Params) 줄 4459 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!Z\_Construct\_UDelegateFunction\_FMODStudio\_OnEventStopped\_\_DelegateSignature() 줄 143 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!UE4CodeGen\_Private::ConstructUPackage(UPackage \* & OutPackage, const UE4CodeGen\_Private::FPackageParams & Params) 줄 4596 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!Z\_Construct\_UPackage\_\_Script\_FMODStudio() 줄 38 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!EFMODEventControlKey\_StaticEnum() 줄 29 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!StaticEnum() 줄 36 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!FFMODEventControlChannel::FFMODEventControlChannel() 줄 10 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!UFMODEventControlSection::UFMODEventControlSection(FVTableHelper & Helper) 줄 227 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!UFMODEventControlSection::\_\_VTableCtorCaller(FVTableHelper & Helper) 줄 52 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!InternalVTableHelperCtorCaller(FVTableHelper & Helper) 줄 3318 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!UClass::HotReloadPrivateStaticClass(unsigned int InSize, EClassFlags InClassFlags, EClassCastFlags InClassCastFlags, const wchar\_t \* InConfigName, void(_)(const FObjectInitializer &) InClassConstructor, UObject ()(FVTableHelper &) InClassVTableHelperCtorCaller, void(_)(UObject \*, FReferenceCollector &) InClassAddReferencedObjects, UClass \* TClass\_Super\_StaticClass, UClass \* TClass\_WithinClass\_StaticClass) 줄 5041 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!GetPrivateStaticClassBody(const wchar\_t \* PackageName, const wchar\_t \* Name, UClass \* & ReturnClass, void(_)() RegisterNativeFunc, unsigned int InSize, unsigned int InAlignment, EClassFlags InClassFlags, EClassCastFlags InClassCastFlags, const wchar\_t \* InConfigName, void(_)(const FObjectInitializer &) InClassConstructor, UObject _(_)(FVTableHelper &) InClassVTableHelperCtorCaller, void(\*)(UObject _, FReferenceCollector &) InClassAddReferencedObjects, UClass ()() InSuperClassFn, UClass ()() InWithinClassFn, bool bIsDynamic, void(_)(UDynamicClass \*) InDynamicClassInitializerFn) 줄 5436 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!UFMODEventControlSection::GetPrivateStaticClass() 줄 221 | C++ | | | UE4Editor-FMODStudio-0002-Win64-Debug.dll!TClassCompiledInDefer::Register() 줄 301 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!UClassRegisterAllCompiledInClasses() 줄 802 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!ProcessNewlyLoadedUObjects(FName Package, bool bCanProcessNewlyLoadedObjects) 줄 986 | C++ | | | UE4Editor-CoreUObject-Win64-Debug.dll!TBaseStaticDelegateInstance\::ExecuteIfSafe(FName \, bool \) 줄 731 | C++ | | | UE4Editor-Core-Win64-Debug.dll!TMulticastDelegate\::Broadcast(FName \, bool \) 줄 955 | C++ | | | UE4Editor-Core-Win64-Debug.dll!FModuleManager::LoadModuleWithFailureReason(const FName InModuleName, EModuleLoadResult & OutFailureReason) 줄 519 | C++ | | | UE4Editor-Core-Win64-Debug.dll!FModuleManager::LoadModule(const FName InModuleName) 줄 347 | C++ | | | UE4Editor-HotReload-Win64-Debug.dll!FHotReloadModule::DoHotReloadInternal(const TMap\\> & ChangedModules, const TArray\\> & Packages, const TArray\\> & InDependentModules, FOutputDevice & HotReloadAr) 줄 799 | C++ | | | UE4Editor-HotReload-Win64-Debug.dll!FHotReloadModule::DoHotReloadFromIDE(const TMap\\> & NewModules) 줄 1526 | C++ | | | UE4Editor-HotReload-Win64-Debug.dll!FHotReloadModule::Tick(float DeltaTime) 줄 1467 | C++ | ==== Watch ==== | - | | this | 0x0000025bd5972c00 (Name=OnEventStopped\_\_DelegateSignature) | UObject \* | | --- | --- | --- | --- | --- | | - | | UObjectBaseUtility | (Name=OnEventStopped\_\_DelegateSignature) | UObjectBaseUtility | | - | | UObjectBase | (Name=OnEventStopped\_\_DelegateSignature) | UObjectBase | | - | | \_\_vfptr | 0x00007ffc63a529d0 {UE4Editor-CoreUObject-Win64-Debug.dll!void(\* UObject::`vftable'[101])()} {0x00007ffc6345c1d0 {UE4Editor-CoreUObject-Win64-Debug.dll!UObject::`vector deleting destructor’(unsigned int)}, …} | void \* \* | | | | [0] | 0x00007ffc6345c1d0 {UE4Editor-CoreUObject-Win64-Debug.dll!UObject::`vector deleting destructor’(unsigned int)} | void \* | | | | [1] | 0x00007ffc62d9af68 {UE4Editor-CoreUObject-Win64-Debug.dll!UObjectBase::RegisterDependencies(void)} | void \* | | | | [2] | 0x00007ffc6365c330 {UE4Editor-CoreUObject-Win64-Debug.dll!UObjectBase::DeferredRegister(UClass \*, const wchar\_t \*, const wchar\_t \*)} | void \* | | | | ObjectFlags | RF\_Public | RF\_Transient | | | | InternalIndex | 21102 | int | | + | | ClassPrivate | 0x0000025b940aae80 (Name=DelegateFunction) | UClass \* | | + | | NamePrivate | OnEventStopped\_\_DelegateSignature | FName | | + | | OuterPrivate | 0x0000025bd5941c20 (Name=/Script/FMODStudio) | UObject \* {UPackage} | ---
**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\ **Post date:** [July 5, 2021, 4:38am UTC](https://qa.fmod.com/t/ue4-crashes-due-to-fmodambient-hot-reload/13992/10 "2021-07-05T04:38:08Z")
Are you able to update to 2.01.10, which is available on our [Downloads](https://fmod.com/download) page, as there have been a number of changes and updates to the 4.26 integration.