[modeller_usage] Error in opening log file.

Hello

I am using Modeller 9v8 and while executing model-disulfide.py, I am encountering the following error.

*C:\Program Files\Modeller9v8\examples\crmodel>mod9v8 model-disulfide.py 'import site' failed; use -v for traceback Cannot open logfile model-disulfide.log: Permission denied*

Please Help me to find a solution to this problem. Thank you

Dr. Prija Ponnan Dept. of Chemistry University of Delhi,Delhi,India