Hi VIVMS,
which function (which VI) returns this warning? Could you post an NI Spy logfile that shows where the code generates that warning?
NI Spy captures calls from your VI to the NI-CAN driver. Launch NI Spy at:
Start » Programs » National Instruments » NI Spy
Once the warning came up, stop your application and save the logfile with NI Spy.
-B2k