DAQ assistant failed. Can't find channel

[duping]

I had my programme for data collecting done two weeks ago, and it worked very well and we did some tests as well. Today I wanna present it to other people, it stucks. Its never happened before, generally I thought maybe some problem with the hardware. I am totally confused. what happened and it out of order right now.
 
I attached the error report,
   The situation was, after connection with laptop, I am gonna running my
programme.
   The DAQ function failed, here we have a window said:
                   Error-200220 occured at DAQmx Create
                   Channel (AI-Voltage-basic). vi
             Possible reson:
             Device identifier is invalid.
             Device Specified: Dev 1
             Task name::_unnamedTask<1>
   And I did the instrument self test, nothing happened but show me one
error report what I followed above.
      In the testing panel, Terminal Configuration function is failed, all
the four selectors: differential, RSE, NRSE, pseudodifferential
can't be reached. So, that's why I think there should be some
problem with physics connection or some place.

Thanks

[Kenny_K]

I am guessing that you are using a USB device.  What I would check is that the Device is not named Dev2 or something different on the new computer.  You can check the name in MAX (Meaurement and Automation Explorer) by click on Devices and Interaces, under which should be a line that says NI-DAQmx devices (if you have the device conencted to your computer).  Under that, it will list any devices that you have connected and/or devices that WERE connected at one time.  If you have connected one device, unplugged it, and now connected a new device, you will have an entry that has Dev1 with and X to it and Dev2 that is green (if it is connected).

If your program is looking for Dev1, and it named the new device Dev2, then you would get that error.  If this is the case, then I would delte the Dev1, and rename the Dev2 to Dev1.

Let me know if this solves your problem.

Kenny

[duping]

thanks . I got the the solution. Maybe the problem located at the connection between PC and DAQ card. After re-install whole system, there is no problme any more- Strange!!