Can not Connect to the robot using ur_rtde

Hi every one,
I have an issue when I want to connect to the robot using ur_rtde I get this error could you please help me solve that?

ur_rtde exception: The following variables was not found by the controller: [payload_inertia],
see which variables are supported by your PolyScope version here:
https://www.universal-robots.com/articles/ur/interface-communication/real-time-data-exchange-rtde-guide/

Hi,
Since payload_inertia looks like it is available I think the problem might be an incorrect typing.

Did you make sure that the request for payload_inertia is of type VECTOR6D ?

It was introduced in 5.11 - check your polyscope version.