Plex Jail won't start when added mount point

[lulu]

I'm getting this message when I add mount point and try to start plex server.
Can someone help me please?
I'm using 11.2-RC1

Code:

Error: concurrent.futures.process._RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/concurrent/futures/process.py", line 175, in _process_worker
	r = call_item.fn(*call_item.args, **call_item.kwargs)
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 122, in main_worker
	res = loop.run_until_complete(coro)
  File "/usr/local/lib/python3.6/asyncio/base_events.py", line 468, in run_until_complete
	return future.result()
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 82, in _run
	return await self._call(f'{service_name}.{method}', serviceobj, methodobj, params=args, job=job)
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 75, in _call
	return methodobj(*params)
  File "/usr/local/lib/python3.6/site-packages/middlewared/worker.py", line 75, in _call
	return methodobj(*params)
  File "/usr/local/lib/python3.6/site-packages/middlewared/schema.py", line 668, in nf
	return f(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/jail.py", line 541, in start
	iocage.start()
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/iocage.py", line 1628, in start
	callback=self.callback
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_start.py", line 66, in __init__
	self.__start_jail__()
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_start.py", line 413, in __start_jail__
	silent=self.silent)
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_common.py", line 81, in logit
	_callback(content, exception)
  File "/usr/local/lib/python3.6/site-packages/iocage_lib/ioc_common.py", line 64, in callback
	raise callback_exception(message)
RuntimeError: mount: /mnt/pool4tb: Operation not supported by device
jail: /sbin/mount -t None -o ro /mnt/pool4tb /mnt/main_vmplug/iocage/jails/plex/root/mnt: failed

"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 161, in call_method
	result = await self.middleware.call_method(self, message)
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1043, in call_method
	return await self._call(message['method'], serviceobj, methodobj, params, app=app, io_thread=False)
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 980, in _call
	return await self._call_worker(serviceobj, name, *args)
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1007, in _call_worker
	job,
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 938, in run_in_proc
	return await self.run_in_executor(self.__procpool, method, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 923, in run_in_executor
	return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs))
RuntimeError: mount: /mnt/pool4tb: Operation not supported by device
jail: /sbin/mount -t None -o ro /mnt/pool4tb /mnt/main_vmplug/iocage/jails/plex/root/mnt: failed

 

[dlavigne]

If the issue persists after updating to RC2 (due out today), create a report at bugs.freenas.org and post the issue number here.