bzr add does not work

Quite a long bunch of error messages when I tried to bzr add some files.

bzr: ERROR: subvertpy.SubversionException: ("Working copy '/home/smartboyhw/wubi/src/grub4dos' is too old (format 9, created by Subversion 1.5)", 155036)

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1141, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 842, in run
    no_recurse, action=action, save=not dry_run)
  File "/usr/lib/python2.7/dist-packages/bzrlib/mutabletree.py", line 52, in tree_write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/mutabletree.py", line 453, in smart_add
    adder.add(file_list, recurse=recurse)
  File "/usr/lib/python2.7/dist-packages/bzrlib/mutabletree.py", line 741, in add
    controldir.ControlDirFormat.find_format(transport)
  File "/usr/lib/python2.7/dist-packages/bzrlib/controldir.py", line 1151, in find_format
    return prober.probe_transport(transport)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/svn/__init__.py", line 176, in probe_transport
    version = check_wc(transport.local_abspath('.').encode("utf-8"))
SubversionException: ("Working copy '/home/smartboyhw/wubi/src/grub4dos' is too old (format 9, created by Subversion 1.5)", 155036)

bzr 2.6b2 on python 2.7.3 (Linux-3.7.0-2-lowlatency-x86_64-with-
    Ubuntu-13.04-raring)
arguments: ['/usr/bin/bzr', 'add']
plugins: bash_completion[2.6b2], builddeb[2.7.0dev], builder[0.7.3],
    bzrtools[2.5.0], changelog_merge[2.6b2], cvsps_import[unknown],
    dbus[0.1.0dev], email[unknown], explorer[1.3.0], fastimport[0.14.0dev],
    git[0.6.9], grep[0.5.0dev], gtk[0.104.0dev], launchpad[2.6b2],
    loom[2.2.0], netrc_credential_store[2.6b2], news_merge[2.6b2],
    pipeline[1.4.0], po_merge[2.6b2], pqm[1.4.0dev], qbzr[0.23.0],
    rewrite[0.6.4dev], search[1.7.0dev], stats[0.2.0dev], svn[1.2.1],
    trac[1.0.0dev], tweet[1.2.0], upload[1.1.0], weave_fmt[2.6b2],
    webdav[1.12.2], xmloutput[0.8.8]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.

also in http://paste.ubuntu.com/1372145/