Try surrounding the full directory location in quotations:
instead of:
D:\Program Files (x86)\Stencyl
use
"D:\Program Files (x86)\Stencyl"
I didn't take a look at the log, but that is exactly what is happening. The space in the location causes the error, but if you surround it all in quotations, it will read the full directory instead of stopping at the first space. Just find out where the program is referencing that directory location, and add the quotations, and it should fix the error.