CMake project cannot be built (Error while building project/When executing step CMake build)

With Qt Creator 4.3.0 I cannot build a CMake project at all. In 4.2.2 it was OK.

The error message: 

Error while building project xy
When executing step "CMake build"

CMake in command line works fine and also with the previous versions of Qt Creator.

Also, Qt Creator shows "CMakeCache.txt" changed many times after cleaning the project (but possibly this is a separate issue).

How can I help you debugging this problem further? I saw no other console output besides the error message.