Weird problem. building a cross platform project, and just in this latest release, the first build within Xcode works fine, run, debug, everything is fine. I quit the running program, maybe edit some code and build it again and it fails with the above error.. Attempting to open the build Log gives me nothing... zip/nada..
This is a C++ program, xcodeproj file created using latest version of CMake... everything has worked in the past.