The only case where AdwCleaner could not create a debug logfile is when it crashes before it starts. If it starts and the user can run at least a scan, there will be 100% a debug logfile created ( make sure that the user checked the option "Activate debug mode" ).
After the scan has finished, the user should press the Cleaning button as well until the Error appears again. After closing AdwCleaner, the debug logfile can be found under C:\AdwCleaner\
It seems that the user does either not activate Debug Mode or can't find the correct logfile.