confused

[Diwaker Gupta]

$ bzr info
[snip]
Format:
       control: Meta directory format 1
  working tree: Working tree format 3
        branch: Branch format 5                         <==
    repository: Knit repository format 1

$ bzr upgrade --format=knit
bzr: ERROR: The branch format Bazaar-NG meta directory, format 1 is
already at the most recent format.                   ^^^^^^^^^^^^^^^^ 
                                              ^^^^^^^^^

I just can't reconcile the above two outputs. What am I missing?

Info:
Branch history:
      1704 revisions
       427 days old
   first revision: Wed 2005-03-09 04:08:15 +0000
  latest revision: Mon 2006-05-08 04:56:25 +0100

Revision store:
      4793 revisions
     22089 KiB
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