Wait mutex error. MSVC 2015 + UE 4.11 prewiev 7 (source build)

Development Programming & Scripting C++
1

Hi

If i have opened project in Editor and try to buld MSVC source code i got error:

26>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets(37,5): error MSB3073: The command “d:\Unreal\Engine\Build\BatchFiles\Build.bat UE4Editor Win64 Development -waitmutex -2015” exited with code -1.
Error MSB3073 The command “d:\Unreal\Engine\Build\BatchFiles\Build.bat UE4Editor Win64 Development -waitmutex -2015” exited with code -1. UE4 C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets 37

For successful building from MSVC need to close Editor and restart MSVC build process. How to fix this problem?

some info:
MSVC 2015 no Servce Packs
UE v 4.11 preview 7 (build from github sources)
Editor v 4.11 preview 7 (build from github sources)
Project - Development Editor target

2

Solved with 4.11 stable build.

3

Back on 4.15