Found the cure, it was related to the god damned autoDetect.
In my case the solution was to change it via MyProjectDirectory-settings:
MyProjectDirectory
RightClick to open selections and select: Open Folder Settings
then opens a setup window for 3 items:
User Workspace ProjectDirectory
select User and then Features/Task: Auto Detect: off
I had Auto Detect: off (for reasons totally unknown to me), changed it to “on” now the build again works.
Big thanks to maxgerhardt for your effort !!
Back in coding…
Eko