Unreal Engine Issues and Bug Tracker (UE-71147)

Description

Project configured to spawn Niagara system via Character blueprint in a Code project fails to Cook, then crashes project on open

Discovered when verifying [Link Removed] (also similar to [Link Removed])

Did not reproduce in a Blueprint Project in //UE4/Release-4.22 at CL 5291112
Did not reproduce with a Niagara System placed in the level.
Does not occur in //UE4/Release-4.21 at CL 4899592 (however encounters [Link Removed], [Link Removed])

CONTENT WORKAROUND:
To avoid loading Niagara Systems in game startup before the Niagara Module is loaded, reference the Niagara System to spawn in Blueprint through a SoftObjectPath variable. This will ensure the project cooks and launches correctly. [Link Removed]

Steps to Reproduce

Setup:

Create and open a Third Person Code Template project
Enable Plugins > Niagara & Niagara Extras
Restart the project

Execution:

Create a Fountain Template Niagara Emitter
Right click your new emitter and Create a Niagara System
Open the ThirdPersonCharacter Blueprint
Create a "E" key event
Connected to the key event, "Spawn Niagara System at Location"
Select your created system
Compile, Save, and Close
Select Save All and Save
File > Package > Windows > Windows 64-bit

Result:
Output log is spammed with

PackagingResults: Warning: Failed to load '/Script/NiagaraEditor': Can't find file '/Script/NiagaraEditor'
PackagingResults: Warning: Can't find file for asset '/Script/NiagaraEditor' while loading NULL.
PackagingResults: Warning: Failed to load '/Script/NiagaraEditor': Can't find file for asset '/Script/NiagaraEditor' while loading NULL.

Then fails with error:

LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000008

Closing and re-opening the project crashes on Editor open with the same callstack as the error

Expected:
Project compiles

Callstack

PackagingResults: Error: === Critical error: ===
PackagingResults: Error: Fatal error!
PackagingResults: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000008
PackagingResults: Error: [Callstack] 0x00007ffe8c011ebd UE4Editor-CoreUObject.dll!UObject::ConditionalPostLoad() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:998]
PackagingResults: Error: [Callstack] 0x00007ffe71250ece UE4Editor-Niagara.dll!UNiagaraEmitter::PostLoad() [d:\build\++ue4\sync\engine\plugins\fx\niagara\source\niagara\private\niagaraemitter.cpp:191]
PackagingResults: Error: [Callstack] 0x00007ffe8c0120db UE4Editor-CoreUObject.dll!UObject::ConditionalPostLoad() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:1031]
PackagingResults: Error: [Callstack] 0x00007ffe8c0bb1ff UE4Editor-CoreUObject.dll!EndLoad() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1598]
PackagingResults: Error: [Callstack] 0x00007ffe8c0aaf27 UE4Editor-CoreUObject.dll!<lambda_abac6bf31806a00cbe632fc7fffc921b>::operator()() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1234]
PackagingResults: Error: [Callstack] 0x00007ffe8c0c998f UE4Editor-CoreUObject.dll!LoadPackageInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1335]
PackagingResults: Error: [Callstack] 0x00007ffe8c0c895a UE4Editor-CoreUObject.dll!LoadPackage() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1431]
PackagingResults: Error: [Callstack] 0x00007ffe8c0d69a9 UE4Editor-CoreUObject.dll!ResolveName() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:751]
PackagingResults: Error: [Callstack] 0x00007ffe8c0de72b UE4Editor-CoreUObject.dll!StaticLoadObjectInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:813]
PackagingResults: Error: [Callstack] 0x00007ffe8c0ddef3 UE4Editor-CoreUObject.dll!StaticLoadObject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:888]
PackagingResults: Error: [Callstack] 0x00007ffe8c0dd968 UE4Editor-CoreUObject.dll!StaticLoadClass() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:921]
PackagingResults: Error: [Callstack] 0x00007ffe70d95541 UE4Editor-niagaraCode.dll!ConstructorHelpersInternal::FindOrLoadClass() [d:\binary_workspaces\ue_4.22\engine\source\runtime\coreuobject\public\uobject\constructorhelpers.h:87]
PackagingResults: Error: [Callstack] 0x00007ffe70d9501c UE4Editor-niagaraCode.dll!AniagaraCodeGameMode::AniagaraCodeGameMode() [d:\documents\unreal_projects\niagaracode\source\niagaracode\niagaracodegamemode.cpp:10]
PackagingResults: Error: [Callstack] 0x00007ffe8bea6cdf UE4Editor-CoreUObject.dll!UClass::CreateDefaultObject() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:3076]
PackagingResults: Error: [Callstack] 0x00007ffe8c0e1c56 UE4Editor-CoreUObject.dll!UObjectLoadAllCompiledInDefaultProperties() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:793]
PackagingResults: Error: [Callstack] 0x00007ffe8c0cfa2f UE4Editor-CoreUObject.dll!ProcessNewlyLoadedUObjects() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:869]
PackagingResults: Error: [Callstack] 0x00007ffe8beab2f7 UE4Editor-CoreUObject.dll!TBaseStaticDelegateInstance<void __cdecl(void)>::ExecuteIfSafe() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:813]
PackagingResults: Error: [Callstack] 0x00007ffe8c473c1b UE4Editor-Core.dll!TBaseMulticastDelegate<void>::Broadcast() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:977]
PackagingResults: Error: [Callstack] 0x00007ffe8c645065 UE4Editor-Core.dll!FModuleManager::LoadModuleWithFailureReason() [d:\build\++ue4\sync\engine\source\runtime\core\private\modules\modulemanager.cpp:530]
PackagingResults: Error: [Callstack] 0x00007ffecc9f8d67 UE4Editor-Projects.dll!FModuleDescriptor::LoadModulesForPhase() [d:\build\++ue4\sync\engine\source\runtime\projects\private\moduledescriptor.cpp:596]
PackagingResults: Error: [Callstack] 0x00007ffecc9f8ff7 UE4Editor-Projects.dll!FProjectManager::LoadModulesForProject() [d:\build\++ue4\sync\engine\source\runtime\projects\private\projectmanager.cpp:63]
PackagingResults: Error: [Callstack] 0x00007ff64df67eb1 UE4Editor-Cmd.exe!FEngineLoop::LoadStartupModules() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3135]
PackagingResults: Error: [Callstack] 0x00007ff64df6d671 UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2536]
PackagingResults: Error: [Callstack] 0x00007ff64df65377 UE4Editor-Cmd.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:129]
PackagingResults: Error: [Callstack] 0x00007ff64df655ca UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
PackagingResults: Error: [Callstack] 0x00007ff64df7315c UE4Editor-Cmd.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:275]
PackagingResults: Error: [Callstack] 0x00007ff64df74ca6 UE4Editor-Cmd.exe!__scrt_common_main_seh() [d:\agent\_work\3\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
PackagingResults: Error: [Callstack] 0x00007ffee9ba3dc4 KERNEL32.DLL!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffeec103691 ntdll.dll!UnknownFunction []
PackagingResults: Error: end: stack for UAT

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-71147 in the post.

10	Login to Vote

Fixed

Component	UE - Niagara
Affects Versions	4.22
Target Fix	4.24

Fix Commit	9967091
Release Commit	9967127

Created	Mar 7, 2019
Resolved	Nov 4, 2019
Updated	Jan 25, 2021

View Jira Issue