Unreal 5.1 crashing on startup

Start up a project, gets to 75% initialisation and then CTD’s every time.

Getting error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000000

Unreal 5.0.3 runs, but 5.1 will not load anything

Tried it with different projects, making a blank project in 5.0.3 and then trying to start 5.1 with that but same thing. Tried all the usual things, full re-install, restarts, updated Nvidia drivers, setting graphics card to default settings etc. etc.

Same deal, CTD every time on load.

Any ideas?

Sent a bug report and ticket but wonder if there are any known fixes for this?

Hey @BillBorez! Welcome to the Forums!

For our 5.1 engine version, you’re going to want to install “Editor Symbols for Debugging” so we can see where your error is pointing in your error log and try and start it up so it crashes again.

EpicGamesLauncher_crh6sNcUXD

Any additional specifics you provide may go a long way in solving your problem!

OK, thanks. Will do this.

Jeebus, how come that’s an extra 63 gigs on the installation?

OK, so I enabled that and I get this message on startup after the CTD

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000000

UnrealEditor_UdpMessaging!UE::UdpMessaging::Private::DoJoinMulticastGroup() [D:\build++UE5\Sync\Engine\Plugins\Messaging\UdpMessaging\Source\UdpMessaging\Private\Transport\UdpMessageTransport.cpp:162]
UnrealEditor_UdpMessaging!UE::UdpMessaging::Private::JoinedToGroup() [D:\build++UE5\Sync\Engine\Plugins\Messaging\UdpMessaging\Source\UdpMessaging\Private\Transport\UdpMessageTransport.cpp:184]
UnrealEditor_UdpMessaging!FUdpMessageTransport::StartTransport() [D:\build++UE5\Sync\Engine\Plugins\Messaging\UdpMessaging\Source\UdpMessaging\Private\Transport\UdpMessageTransport.cpp:244]
UnrealEditor_Messaging!FMessageBridge::Enable() [D:\build++UE5\Sync\Engine\Source\Runtime\Messaging\Private\Bridge\MessageBridge.cpp:81]
UnrealEditor_UdpMessaging!FMessageBridgeBuilder::Build() [D:\build++UE5\Sync\Engine\Source\Runtime\MessagingCommon\Public\MessageBridgeBuilder.h:109]
UnrealEditor_UdpMessaging!FUdpMessagingModule::InitializeBridge() [D:\build++UE5\Sync\Engine\Plugins\Messaging\UdpMessaging\Source\UdpMessaging\Private\UdpMessagingModule.cpp:556]
UnrealEditor_UdpMessaging!FUdpMessagingModule::RestartServices() [D:\build++UE5\Sync\Engine\Plugins\Messaging\UdpMessaging\Source\UdpMessaging\Private\UdpMessagingModule.cpp:354]
UnrealEditor_UdpMessaging!FUdpMessagingModule::StartupModule() [D:\build++UE5\Sync\Engine\Plugins\Messaging\UdpMessaging\Source\UdpMessaging\Private\UdpMessagingModule.cpp:275]
UnrealEditor_Core!FModuleManager::LoadModuleWithFailureReason() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Modules\ModuleManager.cpp:617]
UnrealEditor_Projects!FModuleDescriptor::LoadModulesForPhase() [D:\build++UE5\Sync\Engine\Source\Runtime\Projects\Private\ModuleDescriptor.cpp:696]
UnrealEditor_Projects!FPluginManager::TryLoadModulesForPlugin() [D:\build++UE5\Sync\Engine\Source\Runtime\Projects\Private\PluginManager.cpp:2078]
UnrealEditor_Projects!FPluginManager::LoadModulesForEnabledPlugins() [D:\build++UE5\Sync\Engine\Source\Runtime\Projects\Private\PluginManager.cpp:2154]
UnrealEditor!FEngineLoop::LoadStartupModules() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4179]
UnrealEditor!FEngineLoop::PreInitPostStartupScreen() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:3521]
UnrealEditor!GuardedMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:154]
UnrealEditor!GuardedMainWrapper() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:107]
UnrealEditor!LaunchWindowsStartup() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:244]
UnrealEditor!WinMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:282]
UnrealEditor!__scrt_common_main_seh() [D:\a_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

Any ideas?

I have the same issue, just installed but mine doesnt get to 75% it crashes almost instantly with the following:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000000013c0

UnrealEditor_D3D12RHI
UnrealEditor_D3D12RHI
UnrealEditor_D3D12RHI
UnrealEditor_D3D12RHI
UnrealEditor_D3D12RHI
UnrealEditor_D3D12RHI
UnrealEditor_RHI
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

any ideas? Thanks in advance…

1 Like

Turn off network , UE5 Can start successfully。

1 Like

OK so turning off the network allows me to start the project, as soon as I turn it on however UE5.1 crashes again.

What would be causing this?

UnrealEngine-release\Engine\Plugins\Messaging\UdpMessaging\Source\UdpMessaging\Private\Transport\UdpMessageTransport.cpp
180 row
void JoinedToGroup(const FIPv4Endpoint& UnicastEndpoint, const FIPv4Endpoint& MulticastEndpoint, FSocket* MulticastSocket)
{

#if PLATFORM_SUPPORTS_UDP_MULTICAST_GROUP

TSharedRef<FInternetAddr> MulticastAddr = MulticastEndpoint.ToInternetAddr();
if (UnicastEndpoint.Address == FIPv4Address::Any)
{
	TArray<TSharedPtr<FInternetAddr>> LocapIps;
	ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->GetLocalAdapterAddresses(LocapIps);
	for (const TSharedPtr<FInternetAddr>& LocalIp : LocapIps)
	{
		DoJoinMulticastGroup(MulticastAddr, LocalIp, MulticastSocket);
	}
}
else
{
	TSharedRef<FInternetAddr> UnicastAddr = UnicastEndpoint.ToInternetAddr();
	DoJoinMulticastGroup(MulticastAddr, UnicastAddr , MulticastSocket);
}

#endif
}

} // namespace UE::UdpMessaging::Private

MulticastStocket is nullptr.

OK, I have same question ,when the network is turning off the editor is work,

Maybe, you can try to modify DefaultEngine.ini
[/Script/UdpMessaging.UdpMessagingSettings]
EnableTransport=false

Thx to anyone for trying to solve this error, in advance!

like said the editor works when network is turned off.

but chaning the defaultengine.ini only works for me if i change the line:

bAllowNetworkConnection=True

to

bAllowNetworkConnection=False

(under c:/users/$myusername%/appdata/local/UnrealEngine/5.1/Config/)

does anyone have further information on why it works like this, or maybe if there will be a fix / an update soon…?

Hey, I have the exact same error message when I try to launch unreal engine and it crashes almost instantly too, please did you find a solution ?

I downloaded the DLLs and paste them on \UE_5.2\Engine\Binaries\Win64\D3D12
d3d12SDKLayers
D3D12Core

and downloaded the defaultengine and past it on \UE_5.2\Engine\Config

over 6 months without work and finally working today. let me know if you need the files

Hey, by any chance do you still have those files? I happened to have the same issue and will appreciate if you can share those ddl files with me. Thank you!!!