a) you are on GoDaddy and b) you are using “Default” permalinks. If you’re using default permalinks, please try going to Settings > Permalinks and choosing another option and let us know if that resolves it for you.
Yes, it’s installed in a subfolder of backupserver.ca – I’ve tried validating the feed for backupserver.ca/thedevilsbench/?feed=podcast with the same results.