I installed Debian Wheezy on a computer with two hard drives. Each drive has a software RAID partition (RAID1) but the first partition on the first drive is GPT and the second drive's first partition is /boot. On the software raid is a LVM with root, swap, and home all encrypted. I also tried encrypting the whole LVM before that and got the same error.
I'm pretty sure the RAID and LVM are both MD devices but are using the same name. I'm pretty sure this is how I configured my other computer which isn't UEFI or GPT but had no trouble with it, suggesting a problem with the Debian installer perhaps. I might be wrong though, I can't see what else would be the problem. The installer for Wheezy shouldn't even let me make a mistake this big.
How can I fix this? It's strange.
Edit: I checked /etc/mdadm/mdadm.conf under the initrd using Busybox and there seems to be two entries for a md array called mises though I know I only created one.