Unrecogniced type 'virtual' while compiling any project

Hi guys, i cannot compile any basic unreal project.
I get this error

Running D:/Epic Games/4.10/Engine/Binaries/DotNET/UnrealBuildTool.exe MyProject Development Win64 -project="D:/Stephan/Documents/Unreal Projects/MyProject/MyProject.uproject" -rocket -editorrecompile -progress -noubtmakefiles -2015
@progress push 5%
Parsing headers for MyProjectEditor
  Running UnrealHeaderTool "D:/Stephan/Documents/Unreal Projects/MyProject/MyProject.uproject" "D:\Stephan\Documents\Unreal Projects\MyProject\Intermediate\Build\Win64\MyProjectEditor\Development\UnrealHeaderTool.manifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -rocket -installed
D:/Epic Games/4.10/Engine/Source/Editor/UnrealEd/Classes/Niagara/NiagaraNodeFunctionCall.h(19) : Unrecognized type 'virtual' - type must be a UCLASS, USTRUCT or UENUM
Error: Failed to generate code for MyProjectEditor - error code: OtherCompilationError (5)
UnrealHeaderTool failed for target 'MyProjectEditor' (platform: Win64, module info: D:\Stephan\Documents\Unreal Projects\MyProject\Intermediate\Build\Win64\MyProjectEditor\Development\UnrealHeaderTool.manifest).

Maybe you have an idea how to solve this problems…

Can you share the line that has ‘virtual’ on it in NiagaraNodeFunctionCall.h?