LVM - vgcreate problems

Debian - 2.4.27-3-386
I'm trying to create a volume group using /dev/sdb.

pvcreate /dev/sdb
pvcreate -- physical volume "/dev/sdb" successfully created

vgcreate vg001 /dev/sdb
vgcreate -- no valid physical volumes in command line

I've tried creating a primary partition or extended partition /dev/sdb1.
I've tried setting the partition type in fdisk to 8e (Linux LVM).
Rebooting after each variation.

Figured out my own problem.
I was using lvm10.
I removed it.
Then installed lvm2.
Now it's working.