Question about the raidreconf tool

[fedora-list at jamesplace.net]

I'm looking for some help with the raidreconf tool.

I'm currently attempting this on a test machine. I've got two disks in RAID0 
I want to add a third and change to RAID5

When I execute the command:
raidreconf -o /etc/raidtab -n /etc/raidtab.new -m /dev/md0

I get the following output:
Parsing /etc/raidtab
Parsing /etc/raidtab.new
Your on-disk array MUST be clean first.
reconfiguration failed.

The only hints I could find on google were to execute raidstop /dev/md0

I did that but no change. 

I have also destroyed all data on all three disks and recreated them and 
attempted the raidreconf with no data. Also no success.

Any hint, educated guesses, or clairvoyant interpretation would be greatly 
appreciated.