Here is the feed for my podcast series: http://connector.obssr.od.nih.gov/?feed=podcast&podcast_series=obssr-the-connector-podcast-series. I cannot submit the feed to iTunes because of validation errors. On Feed Validator, I receive the error that the length attribute must be a positive integer. Right now there are five instances of length = "". I have tried manually setting the file size value of each podcast to the number of bytes as an integer, and I have also tried leaving the file size blank to automatically calculate the size. Neither is successful. How can I set the length attribute so my feed will validate?