Grub2 Installing problems

[flowjob]

Hey guys,
I'm trying to install grub2 on a USB, but I can't get it work:
(The USB is ext3 and mounted to /mnt/sdc)

Everytime I try

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grub-install --no-floppy --root-directory=/mnt/sdc dev/sdcit tells me:

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/usr/sbin/grub-bios-setup: warning: File system 'ext2' doesn't support embedding.
/usr/sbin/grub-bios-setup: warning: Embedding is not possbile. GRUB can only be installed in this setup by using blocklist. However, blocklists are UNRELIEABLE and their use is discouraged..
/usr/sbin/grub-bios-setup: error: will not proceed with blocklists
I'm using Ubuntu 12.10 live from my other USB with the preinstalled Grub2
The USB is 16GB 2.0, 1 partition with filesys ext3

Any ideas what's causing this?