error creating a sale ver 6.4
this error occurs when creating a sale:
Traceback (most recent call last): File "/trytond/wsgi.py", line 119, in dispatch_request return endpoint(request, **request.view_args) File "/trytond/protocols/dispatcher.py", line 46, in rpc return methods.get(request.rpc_method, _dispatch)( File "/trytond/wsgi.py", line 86, in auth_required return wrapped(*args, **kwargs) File "/trytond/protocols/wrappers.py", line 161, in wrapper return func(request, pool, *args, **kwargs) File "/trytond/protocols/dispatcher.py", line 212, in _dispatch response = app.make_response(request, result) File "/trytond/wsgi.py", line 142, in make_response response = cls.response(data, request) File "/trytond/protocols/jsonrpc.py", line 190, in response return Response(json.dumps( File "/json/init.py", line 238, in dumps **kw).encode(obj) File "/json/encoder.py", line 199, in encode chunks = self.iterencode(o, _one_shot=True) File "/json/encoder.py", line 257, in iterencode return _iterencode(o, 0) File "/trytond/protocols/jsonrpc.py", line 68, in default return marshaller(obj) File "/json/encoder.py", line 179, in default raise TypeError(f'Object of type {o.class.name} ' TypeError: Object of type sale.invoice.term is not JSON serializable