Betterrev error - hg pull fails with: abort: repository is unrelated

[Mike Burton]

I'm getting Betterrev error - hg pull fails with:  abort: repository is unrelated

[info] application - Running command: [/bin/sh, scripts/generate_webrev.sh, ., ssh://hg@bitbucket.org/karianna/better-test-repo, /Users/mikeburton/DEV/Java/BetterRev/betterrev_project/betterrev/public/webrevs/webrev-better-test-repo-2]
[info] application - out > Revert to c29b583938b1 later
[info] application - out > Pull the changeset in
[debug] application - Created new Contribution - id: 1, bitbucket username: richardwarburton
[debug] application - ImportPullRequestsEvent received.
[debug] application - Created new Contribution - id: 74, bitbucket username: Differents
[info] application - out > pulling from ssh://hg@bitbucket.org/karianna/better-test-repo
[info] application - err > abort: repository is unrelated

Same as if I run from command line:  hg pull ssh://hg@bitbucket.org/karianna/better-test-repo

Any ideas please?

Best Regards

Mike Burton