[oe] Help me

[Debasree Mallick]

Hi,
When i try to run this command
mtn --db=OE.mtn co -b org.openembedded.dev
It givs a error..Error is

mtn: misuse: layout of database /stuff/OE.mtn doesn't match this version
of monotone
mtn: misuse: wanted schema ae196843d368d042f475e3dadfed11e9d7f9f01e, got
48fd5d84f1e5a949ca093e87e5ac558da6e5956d
mtn: misuse: try 'mtn db migrate' to upgrade
mtn: misuse: (this is irreversible; you may want to make a backup copy
first)

I am using Fedora5...
Please help me to solve this problem..
Thanks
Debasree