Switch tag version

[Sylvain Bonnemaison]

I'm updating my source code using '~openerp/openobject-addons/4.2/'. I 
get the following message during update process :

Update branch '..\..\dev.sources\python\OpenERP Addons 4.2'
Using saved location: 
bzr+ssh://sylvain.bonnemaison@bazaar.launchpad.net/~openerp/openobject-addons/4.2/
No revisions to pull.
Conflicting tags:
    4.2.3.3

What does it mean? How to solve this problem?

Thanks.