bzr error

[Charliej]

Could someone tell me what is causing this error please

Thanks in advance for your help :)

charliej at charliej:~$ bzr push 
http://bazaar.launchpad.net/~motu-mentoring-reception/reception-data/main
bzr: ERROR: bzrlib.errors.UnlockableTransport: Cannot lock: transport is 
read only: <bzrlib.transport.http._pycurl.PyCurlTransport 
url=http://bazaar.launchpad.net/~motu-mentoring-reception/reception-data/main/.bzr/repository/> 


Traceback (most recent call last):
 File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 650, 
in run_bzr_catch_errors
   return run_bzr(argv)
 File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 612, 
in run_bzr
   ret = run(*run_argv)
 File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 304, 
in run_argv_aliases
   return self.run(**all_cmd_args)
 File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 803, 
in run
   push_result = br_from.push(br_to, overwrite)
 File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 127, 
in read_locked
   return unbound(self, *args, **kwargs)
 File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1696, in 
push
   stop_revision, _hook_master=master_branch)
 File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 127, 
in read_locked
   return unbound(self, *args, **kwargs)
 File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1551, in 
push
   target.lock_write()
 File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1308, in 
lock_write
   self.repository.lock_write()
 File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 235, 
in lock_write
   self.control_files.lock_write()
 File "/usr/lib/python2.5/site-packages/bzrlib/lockable_files.py", line 
234, in lock_write
   self._lock.lock_write()
 File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 420, in 
lock_write
   self.wait_lock()
 File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 387, in 
wait_lock
   self.attempt_lock()
 File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 198, in 
attempt_lock
   raise UnlockableTransport(self.transport)
UnlockableTransport: Cannot lock: transport is read only: 
<bzrlib.transport.http._pycurl.PyCurlTransport 
url=http://bazaar.launchpad.net/~motu-mentoring-reception/reception-data/main/.bzr/repository/> 


bzr 0.15.0 on python 2.5.1.final.0 (linux2)
arguments: ['/usr/bin/bzr', 'push', 
'http://bazaar.launchpad.net/~motu-mentoring-reception/reception-data/main'] 


** please send this report to bazaar at lists.ubuntu.com