I have created my own hg repository by converting it from svn one. It does not
have the "default" branch and as a result the poll seems to fail:

Started on Sep 14, 2007 12:06:51 PM
[workspace] $ hg id default
Failed to check the tip revision
null
hudson.AbortException
at
hudson.plugins.mercurial.MercurialSCM.getTipRevision(MercurialSCM.java:80)
at
hudson.plugins.mercurial.MercurialSCM.pollChanges(MercurialSCM.java:56)
at
hudson.model.AbstractProject.pollSCMChanges(AbstractProject.java:526)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:234)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:266)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
Done. Took 0 seconds
No changes

Moreover there seems to be on UI to configure the branch I want the hudson to
use.