Thankyou for the report. I've filed a bug against the bzr-svn plugin. https://bugs.edge.launchpad.net/bzr-svn/+bug/160232 Can you determine at all why it's not able to open the svn url? Is /home/mez/devnull/branches/trunk the svn branch itself, or a bzr branch? If the former, you might need to give a file:/// url explicitly? (I'm just guessing, I haven't used bzr-svn much.)