Cloudmin instances not starting on fresh install

I'm running a Debian 7.0 install on a HP Proliant DL380 G5, I ran the Cloudmin GPL install script and instances are not starting although they are properly created (no errors there) and I get this error Detailed status error Could not fetch Xen instances : WARING: Can't find toolstack xm, fallback to default! ERROR: A different toolstack (xl) have been selected!  The image of the instance is a CentOS 5.7 Xen instance with base os - downloaded via Cloudmin. Another error is the one regarding pvGrub and pyGrub not being found - when I choose for the instance to boot its own kernel rather than the host system one.

What should I do?

Thanks.