I get above error when i run the VI. I have the vI calling from NI- DAQ (legacy drivers) and PXI 6070E .I have reset NI-DAQ driver but i still get the same error. Currently i have on my system DAQmax and NI- DAQ legacy drivers and devices and LV 8.20....but originally the VI was written using DAQ (legacy) drivers. I want to know how to make it work. Please help!