PXI switch error

[AVP_infy]

Hello i m using PXI switches (PXI 2529, PXI 2503). It was wotking fine for me. But right now i m encountering error. error details are given below.Pls have alook at it and give me a solution

Error -1074135030 occurred at niSwitch Initialize With Topology.vi

Possible reason(s):
Failure loading driver module.

The driver for the DAQmx switch is not loaded

[Steven_C]

Hi AVP_infy,

Could you please let me know if any part of the hardware or software configuration changed before getting this error? Could you please let me know if upgrading any NI software is what triggered this error? Please let me know. Thanks!

Best regards,

Steven