Fatal error: Call to undefined function: ftp_connect() in /.........../plugins/system/vmrss.php on line 131

OK this a simple answer, but you may need to speak to your hosting company to get them to fix it.

The FTP function in PHP is turned off, to check this is true, you can goto Help > System Info > PHP Information

In that list you will see a section called

FTP in huge bold about half way down, it should have 

FTP
FTP support enabled

There is also another part that says
--enable-ftp
Just at the top somewhere, do a search on the page and see what you can find for "ftp".

You have the option to turn off the FTP function, so it just generates the XML script, so you can then add the link to it in google and google will collect it from your site rather than you having to FTP it up (Scheduled Upload), removing this error.

This is usually the best way to upload.

www.yoursite.com/ plugins/system/vmrss/all_products.xml
If you go to your Google base account, you can add the link above to the feed, and it will collect the info.

http://base.google.co.uk/support/bin/answer.py?answer=76749&hl=en_GB
There is a bit of information from Google how to do that here, I will make a video about this soon, to show how to do it.

This only works on feeds less than 20mb's, but the FTP system works on any size feed.
It says more about that here
http://base.google.co.uk/support/bin/answer.py?answer=59556&hl=en_GB

All the best
Ian