On my Dahua NVR most of my Dahua cams work fine with motion detection. 2 of my IPC-HDW4231EM-AS will not play nice with my NVR motion detection, i get an error message that says, "channel 4 failed to get configuration" for example. In the NVR settings I have tried labeling the cams as, "private" "custom" and "ONVIF." The Event/Video Detection portion of NVR settings will not accept these cams. Any suggestions are appreciated.