FreeNAS

UnboundLocalError: local variable 'name' referenced before assignment
  File "middlewared/main.py", line 150, in call_method
    result = await self.middleware.call_method(self, message)
  File "asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "middlewared/main.py", line 895, in call_method
    return await self._call(message['method'], serviceobj, methodobj, params, app=app)
  File "asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "middlewared/main.py", line 863, in _call
    return await methodobj(*args)
  File "asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "plugins/disk.py", line 616, in swaps_configure
    self.logger.warn(f'Failed to create gmirror {name}', exc_info=True)
RuntimeError: All mirror names are taken
  File "plugins/disk.py", line 613, in swaps_configure
    name = new_swap_name()
  File "plugins/disk.py", line 774, in new_swap_name
    raise RuntimeError('All mirror names are taken')