Packaging error with 4.19

Hi Guys,

This is a real puzzle to me and i hope someone has ideas. I get the below errors, even though i have split my levels into chunks in order to keep build data below 2gb per level.
I also tried creating new files in a brand new project, and did a test build each time i added a level to be streamed. Each build worked. But then when i bake the lighting and try it i get the errors, so i assume its not an error generated by corrupt geometry or materials. Its a unreal studio project using datasmith by the way. Any help really appreciated.

UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: === Critical error: ===
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: Fatal error: [File:D:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Core\Public\Serialization/MemoryWriter.h] [Line: 42]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: FMemoryWriter does not support data larger than 2GB. Archive name: None.
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000FD92A06D KERNELBASE.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000D1777884 UE4Editor-ApplicationCore.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000CCF76D9B UE4Editor-Core.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000CCEB1949 UE4Editor-Core.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000CC7817C4 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000CC891967 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000CC9D20C8 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000B09E5264 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: === Critical error: ===
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000B088EEEB UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000B089022D UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: Fatal error: [File:D:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Core\Public\Serialization/MemoryWriter.h] [Line: 42]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000B089BC59 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000B074A580 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: FMemoryWriter does not support data larger than 2GB. Archive name: None.
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000B0771CB0 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x000000003F1DEB20 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x000000003F1D69FA UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000FD92A06D KERNELBASE.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x000000003F1D6C4A UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x000000003F1E4177 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x000000003F1E4FBF UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000D1777884 UE4Editor-ApplicationCore.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000777559CD KERNEL32.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000779B383D ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000779B383D ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: end: stack for UAT
PackagingResults: Error: [Callstack] 0x00000000CCF76D9B UE4Editor-Core.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000CCEB1949 UE4Editor-Core.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000CC7817C4 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000CC891967 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000CC9D20C8 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000B09E5264 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000B088EEEB UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000B089022D UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000B089BC59 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000B074A580 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000B0771CB0 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x000000003F1DEB20 UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x000000003F1D69FA UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x000000003F1D6C4A UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x000000003F1E4177 UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x000000003F1E4FBF UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000777559CD KERNEL32.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000779B383D ntdll.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000779B383D ntdll.dll!UnknownFunction []