Cannot Create File Error on AVS Video Converter

I am converting my DVD files to AVI so I can post it on YouTube. However, it won't let me convert on AVS Video Converter. I already tried adding some more files for conversion but it still failed and run the latest AVS version How can this be fixed?
Error
Cannot create file. Probably your output file has a read-only attribute, or it is occupied with another application, or you used an invalid name for your file, etc.
OK
