[Observium] switch from trunk to stable

How do i switch from trunk to stable?

observium@obsmon:~$ svn switch --relocate http://svn.observium.org/svn/observium/trunk http://svn.observium.org/svn/observium/branches/stable svn: E155024: Invalid relocation destination: 'http://svn.observium.org/svn/observium/branches/stable' (does not point to target) observium@obsmon:~$

Thanks, cody