Lightmass crashed

Hi,
I’m trying to bake lights on My scene but i have some issues.
Can anyone help me?

=== Lightmass crashed: ===Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x0000000000000000
Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Programs/UnrealLightmass/Private/Lighting/LightingSystem.cpp] [Line: 1458]
Static lighting thread exception:
Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Core/Private/GenericPlatform/GenericPlatformMemory.cpp] [Line: 197]
Ran out of memory allocating 536870912 bytes with alignment 0
0x00007ffe32a5a218 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffe32ad8bd6 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ff6ab3ee4e0 UnrealLightmass.exe!TArray<Lightmass::FTexelToCorners,TSizedDefaultAllocator<32> >::ResizeGrow() []
0x00007ff6ab462723 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ProcessTextureMapping() []
0x00007ff6ab448eb4 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ThreadLoop() []
0x00007ff6ab4441b3 UnrealLightmass.exe!Lightmass::FMappingProcessingThreadRunnable::Run() []
0x00007ffe32e6d547 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffe32e667c0 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffecaec54e0 KERNEL32.DLL!UnknownFunction []
0x00007ffeccf4485b ntdll.dll!UnknownFunction []

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x0000000000000000

0x00007ffeb5ae19e9 VCRUNTIME140.dll!UnknownFunction []
0x00007ff6ab46273d UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ProcessTextureMapping() []
0x00007ff6ab448eb4 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::ThreadLoop() []
0x00007ff6ab4441b3 UnrealLightmass.exe!Lightmass::FMappingProcessingThreadRunnable::Run() []
0x00007ffe32e6d547 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffe32e667c0 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffecaec54e0 KERNEL32.DLL!UnknownFunction []
0x00007ffeccf4485b ntdll.dll!UnknownFunction []

0x00007ff6ab438966 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::MultithreadProcess() []
0x00007ff6ab407c04 UnrealLightmass.exe!Lightmass::FStaticLightingSystem::FStaticLightingSystem() []
0x00007ff6ab3ba339 UnrealLightmass.exe!Lightmass::BuildStaticLighting() []
0x00007ff6ab3e0d57 UnrealLightmass.exe!Lightmass::LightmassMain() []
0x00007ff6ab3ffdc3 UnrealLightmass.exe!main() []
0x00007ff6ab4688b4 UnrealLightmass.exe!__scrt_common_main_seh() []
0x00007ffecaec54e0 KERNEL32.DLL!UnknownFunction []
0x00007ffeccf4485b ntdll.dll!UnknownFunction []