Having trouble packaging even an empty project using Flex.
UATHelper: Packaging (Windows (64-bit)): Running UnrealHeaderTool UE4Game "D:\UnrealEngine-FleX-4.19.2\Engine\Intermediate\Build\Win64\UE4Game\Shipping\UE4Game.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Source\Flex\Classes/FlexFluidSurfaceActor.h(11): error C2504: 'AInfo': base class undefined
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Source\Flex\Classes/FlexFluidSurfaceActor.h(12): error C3646: 'Super': unknown override specifier
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Source\Flex\Classes/FlexFluidSurfaceActor.h(12): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Intermediate\Build\Win64\UE4\Inc\Flex\FlexFluidSurfaceActor.gen.cpp(63): error C2039: 'StaticConfigName': is not a member of 'AFlexFluidSurfaceActor'
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Intermediate\Build\Win64\UE4\Inc\Flex\FlexFluidSurfaceActor.gen.cpp(63): error C3861: 'StaticConfigName': identifier not found
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Intermediate\Build\Win64\UE4\Inc\Flex\FlexFluidSurfaceActor.gen.cpp(63): error C2039: 'AddReferencedObjects': is not a member of 'AFlexFluidSurfaceActor'
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Intermediate\Build\Win64\UE4\Inc\Flex\FlexFluidSurfaceActor.gen.cpp(63): error C2065: 'AddReferencedObjects': undeclared identifier
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Intermediate\Build\Win64\UE4\Inc\Flex\FlexFluidSurfaceActor.gen.cpp(63): error C3083: 'Super': the symbol to the left of a '::' must be a type
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Intermediate\Build\Win64\UE4\Inc\Flex\FlexFluidSurfaceActor.gen.cpp(63): error C3083: 'WithinClass': the symbol to the left of a '::' must be a type
UATHelper: Packaging (Windows (64-bit)): D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Intermediate\Build\Win64\UE4\Inc\Flex\FlexFluidSurfaceActor.gen.cpp(65): error C2614: 'AFlexFluidSurfaceActor': illegal member initialization: 'Super' is not a base or member
UATHelper: Packaging (Windows (64-bit)): C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.15.26726\INCLUDE\vcruntime_new.h(71): error C4577: 'noexcept' used with no exception handling mode specified; termination on exception is not guaranteed. Specify /EHsc
UATHelper: Packaging (Windows (64-bit)): ERROR: UBT ERROR: Failed to produce item: D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Binaries\Win64\UE4-Flex-Win64-Shipping.lib
UATHelper: Packaging (Windows (64-bit)): ERROR: Command failed (Result:5): D:\UnrealEngine-FleX-4.19.2\Engine\Binaries\DotNET\UnrealBuildTool.exe UE4Game Win64 Shipping -NoUBTMakefiles -remoteini="D:\Unreal Projects\Flex_VR_Test" -skipdeploy -noxge -NoHotReload -ignorejunk. See logfile for details: 'UnrealBuildTool-2018.10.23-14.29.18.txt'
PackagingResults: Error: UBT ERROR: Failed to produce item: D:\UnrealEngine-FleX-4.19.2\Engine\Plugins\GameWorks\Flex\Binaries\Win64\UE4-Flex-Win64-Shipping.lib
PackagingResults: Error: Command failed (Result:5): D:\UnrealEngine-FleX-4.19.2\Engine\Binaries\DotNET\UnrealBuildTool.exe UE4Game Win64 Shipping -NoUBTMakefiles -remoteini="D:\Unreal Projects\Flex_VR_Test" -skipdeploy -noxge -NoHotReload -ignorejunk. See logfile for details: 'UnrealBuildTool-2018.10.23-14.29.18.txt'
PackagingResults: Error: Unknown Error
No errors when I built Flex from source. Do I need to go through code and fix it myself? Or is there some other solution?