Itunes connect, “Can’t download episodes from your feed” 301 redirect

Hi, I’m trying to validate my feed https://www.urbanbudo.it/feed/mp3/ on itunes, but everytime appear this error: “Can’t download episodes from your feed”

I contact the apple support and they said me:
“In researching this issue, I tested the episode link in your RSS feed using a third-party Trace tool and was prompted the episode has a “301 Redirect” to another file.”

I don’t have any idea about what I have to do. May you help me?