Meru Controller Radius and NPS

Hello,

I have a Meru MC3200 which I have updated to the latest version recently. There is a Radius configured pointing at a Microsoft NPS to authenticate AD users to the Wifi. But sonce the update of the controller, my windows server is polluted with the same error message "A RADIUS message with the Code filed set to 4, which is not valid, was received on port 1812 from Radius client Meru-Controller-MC3200. Valid values of the RADIUS Code field are documented in RFC2865."

I have found nothing in the RFC.

Any idea ?

Thank you