During a first calculation, an error message may appear to inform that the calculation was not started.
This message appears generally on Windows during a first calculation for a project or when the output directory has been changed.
When Windows works in a directory for a first time, it operates a series a verification that may take a long time. The surveillance mechanism inside SunExposure may then consider than some process is not working properly. We chose in that case the stop the calculation (even though waiting longer for Windows to finish would work).
It is sufficient to relaunch the calculation to solve the problem in most cases.
You’ll find in the Help pages other methods to solve the problem if it remains.