We have a winner !

This WS was originally created in 19.0 and it was still registered there. So the webapp.exe was blocked by WAS 19.0 execution.

Had nothing to do with Kaspersky or AV intrusion..

I just deleted the app from WAS 19.0 layer, and the .exe got available to be overwritten by the 19.1 compiler..

Thanks Guys

PS. Sorry for the delay in answer this.. only had chance to get back to it today.