There are no errors in your xml file. I would try sending it again. If you've named it froogle.xml, make sure this is also the name you've registered with Google Base.

For clarity reasons, line 52 is:

PHP Code:
<g:pickup>true</g:pickup> 
Your feed would validate if not for the <g:mpn> which is required by Google Base. So, I would suspect that you've tried sending a file before or something like that and they have denied the original file. Sending it again should remedy it. Allow a few hours for it to be accepted.

P.S.

I like your hot sauce!