Can't build in 4.21

[whitetigle]

Hi build fails.

So here's my log. Thanks in advance for your help!

Using Visual Studio 2015 14.0 toolchain (D:\Microsoft Visual Studio 14.0\VC) and Windows 8.1 SDK (C:\Program Files (x86)\Windows Kits\8.1).
LogPlayLevel:   Parsing headers for Demo
LogPlayLevel:     Running UnrealHeaderTool "D:\workspace\Unreal.js-demo\Demo.uproject" "D:\workspace\Unreal.js-demo\Intermediate\Build\Win64\Demo\Development\Demo.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -installed
LogPlayLevel: Error:   D:/unreal/UE_4.21/Engine/Plugins/Marketplace/UnrealJS/Source/V8/Public/JavascriptIsolate.h(16) : LogCompile: Error: An explicit Category specifier is required for any property exposed to the editor or Blueprints in an Engine module.
LogPlayLevel: Error:   D:/unreal/UE_4.21/Engine/Plugins/Marketplace/UnrealJS/Source/JavascriptUMG/JavascriptToolbarButtonContext.h(45) : LogCompile: Error: An explicit Category specifier is required for Blueprint accessible functions in an Engine module.
LogPlayLevel: Error:   D:/unreal/UE_4.21/Engine/Plugins/Marketplace/UnrealJS/Source/JavascriptUMG/JavascriptToolbarButtonContext.h(48) : LogCompile: Error: An explicit Category specifier is required for Blueprint accessible functions in an Engine module.
LogPlayLevel: Error:   Error: UnrealHeaderTool failed for target 'Demo' (platform: Win64, module info: D:\workspace\Unreal.js-demo\Intermediate\Build\Win64\Demo\Development\Demo.uhtmanifest, exit code: OtherCompilationError (5)).
LogPlayLevel: Took 72,667387s to run UnrealBuildTool.exe, ExitCode=5

[crocuis]

Fixed.

[whitetigle]

Thanks!