Project suddenly needs module rebuild ô.o

I’m a BP guy, i guess this means i have to install VS2017 now to rebuild my project ? =(

Running C:/Program Files/Epic
Games/UE_4.15/Engine/Binaries/DotNET/UnrealBuildTool.exe
ProjectName Development Win64
-project=“D:/Unreal/ProjectName/ProjectName.uproject”
-editorrecompile -progress -NoHotReloadFromIDE No Visual C++ installation was found. Please
download and install Visual Studio
2015 with C++ components. Creating
makefile for Camera (no existing
makefile) Performing full C++ include
scan (no include cache file)

How can i build this thing from source? And how the hell can this happen. I just saved all, and quit the engine as usual…

My last backup is quite old … need to worry? :frowning: