'openerp-server 5.0 start error - bzr error

Actually when I launch the openerp-server 5.0 I'm getting following error and I have no clue why it is happening. Maybe after a system update?

bzr: error: not a branch: "/usr/lib/python2.5/site-packages/openerp-server/".

I have looked everywhere on Google but no answer. Do you have any idea?

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