No WorkingTree exists after branching

[Xue Fuqiao]

I'd like to initialize my local bzr repo for Emacs after installing
bzr. Here's my procedure:

$ cd emacs-repo/
$ bzr init-repo main/
$ cd main/
$ bzr branch bzr+ssh://xfq@bzr.savannah.gnu.org/emacs/trunk trunk
Branched 114717 revisions.

Then I tried "bzr st":
$ bzr st
bzr: ERROR: No WorkingTree exists for
"file:///home/xfq/emacs-repo/main/trunk/.bzr/checkout/".

"ls" without options has no output, either. I'm not sure why. I read
the output of "bzr help branch" and searched existing FAQs/questions
but didn't get anything that looked promising. Can anyone point me in
the right direction?

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Here's my output of "bzr --version":
Bazaar (bzr) 2.6.0
  Python interpreter: /usr/bin/python 2.7.5
  Python standard library: /usr/lib/python2.7
  Platform: Linux-3.11.0-12-generic-x86_64-with-Ubuntu-13.10-saucy
  bzrlib: /usr/lib/python2.7/dist-packages/bzrlib
  Bazaar configuration: /home/xfq/.bazaar
  Bazaar log file: /home/xfq/.bzr.log