https://bugzilla.mozilla.org/show_bug.cgi?id=1100027
1100027 - "error: pretxnchangegroup.b_singlehead hook raised an exception: 'wrappedlocalrepo'...
RESOLVED (gps) in Developer Services - Mercurial: hg.mozilla.org. Last updated 2014-11-15.
errorbhookraisedexception