VISA: (Hex 0xBFFF0072) The resource is valid, but VISA cannot currently access it.

Hi

Iam using NI PXIe 8135 RT controller.This error has been popping up everytime.

Property Node (arg 1) in VISA Configure Serial Port (Instr).vi

Error -1073807246

Possible reason(s):

VISA: (Hex 0xBFFF0072) The resource is valid, but VISA cannot currently access it.

We made a new real time project and ran a sample program of basic serial write and read. The visa configure serial port function is outputting this error in error out indicator.  We are sure other services(putty, hyperterminal, com port toolkit) are not accessing the controller comport.We are stuck at this error for quite few days.

Regards

EKANTH