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c++crashunreal-engine4

Access Violation on FObjectFinder

I got a problem with my project in unreal. I wrote some code about a month ago and it worked fine until yesterday when the editor started crashin on launch. I get this error message in the log:

[2018.06.25-20.39.29:731][  0]LogWindows: Error: === Critical error: ===
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: 
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: Fatal error!
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: 
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000008d0
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: 
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x000000002548206A UE4Editor-Landscape.dll!UnknownFunction []
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x000000000B927D45 UE4Editor-Engine.dll!UnknownFunction []
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x000000000B95BF0E UE4Editor-Engine.dll!UnknownFunction []
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x00000000145DE8FD UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x000000001469DABC UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x00000000146B5259 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x00000000146B4774 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:731][  0]LogWindows: Error: [Callstack] 0x00000000146CB0C3 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000146D5A3A UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000146D51B2 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000F7A72E21 UE4Editor-Lyfe_Game.dll!ConstructorHelpersInternal::FindOrLoadObject<UParticleSystem>() [c:\program files\epic games\ue_4.18\engine\source\runtime\coreuobject\public\uobject\constructorhelpers.h:35]
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000F7A7314F UE4Editor-Lyfe_Game.dll!UCompound_ParticleComponent_Cell::UCompound_ParticleComponent_Cell() [c:\users\megapoort\desktop\lyfe\lyfe_game\source\lyfe_game\private\compound_particlecomponent_cell.cpp:30]
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000144605CD UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x0000000014698696 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000145E3EC4 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000F7A6B41D UE4Editor-Lyfe_Game.dll!ACompoundCloud_Cell::ACompoundCloud_Cell() [c:\users\megapoort\desktop\lyfe\lyfe_game\source\lyfe_game\private\compoundcloud_cell.cpp:64]
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000144605CD UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000146D91B0 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000146BB41F UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x0000000014462547 UE4Editor-CoreUObject.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000149CE6C0 UE4Editor-Core.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x0000000014C22282 UE4Editor-Core.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x000000004489F60D UE4Editor-Projects.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x000000004489F91E UE4Editor-Projects.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000B66F7F71 UE4Editor.exe!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000B66FC4EC UE4Editor.exe!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000B66F525A UE4Editor.exe!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000B66F54AA UE4Editor.exe!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000B6702379 UE4Editor.exe!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x00000000B6703D57 UE4Editor.exe!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x000000005ED03034 KERNEL32.DLL!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x000000005F271431 ntdll.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: [Callstack] 0x000000005F271431 ntdll.dll!UnknownFunction []
 [2018.06.25-20.39.29:732][  0]LogWindows: Error: 
 [2018.06.25-20.39.29:750][  0]LogExit: Executing StaticShutdownAfterError
 [2018.06.25-20.39.29:751][  0]LogWindows: FPlatformMisc::RequestExit(1)
 [2018.06.25-20.39.29:751][  0]Log file closed, 06/25/18 22:39:29

compoundcloud_cell.cpp:64 is where I create a default subobject for the actor. In its constructor (compound_particlecomponent_cell.cpp:30) The code that crashes the editor is located. The line that is logged here is:

 auto psAsset = ConstructorHelpers::FObjectFinder<UParticleSystem>(TEXT("ParticleSystem'/Game/ParticleSystems/PS_CompoundCloud_SingleCelled.PS_CompoundCloud_SingleCelled'"));

The code snippet where I create the component looks like this:+

std::string center = "CenterSystem";
    UCompound_ParticleComponent_Cell* temp = CreateDefaultSubobject<UCompound_ParticleComponent_Cell>(center.c_str());
    particles.Add(temp);
    RootComponent = temp;

Has anybody got any idea why this might suddenly cause crashes? I've worked on the particle system a lot lately but the name is still the same so I thought it shouldn't affect the object finder.

It would be fantastic if someone could help me with this. Thanks in advance.

Solution

  • Okay, so it was nothing to do with the FObject finder or the particle system itself. There were some unconnected nodes in the material used in the particle system. Check your materials!