[Zope] can't create user with zopectl - Resource temporarily unavailable

Hi I've been trying to use adduser through zopectl on a dev instance of zope but get the following error. Is the lock file the problem? Thanks File "/opt/Zope-2.8/lib/python/ZODB/FileStorage/FileStorage.py", line 114, in __init__ self._lock_file = LockFile(file_name + '.lock') File "/opt/Zope-2.8/lib/python/ZODB/lock_file.py", line 63, in __init__ lock_file(self._fp) File "/opt/Zope-2.8/lib/python/ZODB/lock_file.py", line 42, in lock_file fcntl.flock(file.fileno(), _flags) IOError: [Errno 11] Resource temporarily unavailable