Identical mount points for two file systems when installing Linux

So, I'm going through Crunchbang's installer (very similar to Debian's), and am at the partitioning step. I chose the 'Guided - use entire disk and set up encrypted LVM' method (usually I do manual without encryption). It wiped my disk, and I set my encryption pass phrase. So now this is my current partition configuration LVM VG $HOSTNAME, LV root - 242.7 GB Linux device-mapper (line #1 242.7 GB f ext4 / LVM VG $HOSTNAME, LV swap_1 - 7.1 GB Linux device-mapper (line #1 7.1 GB f swap swap Encrypted volume (sda5_crypt) - 249.8 GB Linux device-mapper (cry #1 249.8 GB K lvm SCSI1 (0,0,0) (sda) - 250.1 GB ATA WDC WD2500BEKT-7 #1 primary 254.8 MB B F ext2 /boot #5 logical 249.8 GB f crypto (sda5_crypt) SCSI5 (0,0,0) (sdb) - 16.0 GB JetFlash Transcend 16GB #1 primary 16.0 GB B fat32 The last entry is obviously the USB drive I've booted from, but I'm including it for completeness. I may have inadvertently done something to it. When I try to write changes to disk, I get the following error message [!!] Partition disks Identical mount points for two file systems Two file systems are assigned the same mount point (/): LVM VG $HOSTNAME, LV root and SCSI1 (0,0,0), partition #5 (sda). Please correct this by changing mount points.