TypeError : can't pickle JObject objects

[judith-lambert-m]

using the API and PythonNet to control the robot in c#
sending a JSON object in the move() method raise an error

JObject prm = new JObject(new JProperty("movement", 1), new JProperty("path", "joint"), new JProperty("j0", 20)); robot_.move(prm);

error : Python.Runtime.PythonException: 'TypeError : can't pickle JObject objects'

error info:
File "C:\python37\lib\site-packages\dorna-1.4.2-py3.7.egg\dorna\api.py", line 1904, in play
data = self.command({"id": id_list})
File "C:\python37\lib\site-packages\dorna-1.4.2-py3.7.egg\dorna\api.py", line 955, in command
_result = self._command_mask(_result)
File "C:\python37\lib\site-packages\dorna-1.4.2-py3.7.egg\dorna\api.py", line 878, in _command_mask
x = copy.deepcopy(c)
File "C:\python37\Lib\copy.py", line 150, in deepcopy
y = copier(x, memo)
File "C:\python37\Lib\copy.py", line 241, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "C:\python37\Lib\copy.py", line 169, in deepcopy
rv = reductor(4)

at Python.Runtime.PyObject.Invoke(PyTuple args, PyDict kw)
at Python.Runtime.PyObject.InvokeMethod(String name, PyTuple args, PyDict kw)
at Python.Runtime.PyObject.TryInvokeMember(InvokeMemberBinder binder, Object[] args, Object& result)
at CallSite.Target(Closure , CallSite , Object , JObject )
at System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid2[T0,T1](CallSite site, T0 arg0, T1 arg1)

looks like the problem would be in deepcopy