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Unknown error code with RFSA

I'm getting error code -1074118655 occasionally when I call niRFSA_FetchIQSingleRecordComplexI16 in a streaming application.  I tried calling niRFSA_error_message to get the error text but I it did not have any.  Can you tell me what would cause the error and what the error means?
 
Thanks,
Andy
Systems Engineering - National Instruments
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Andy,

you can call niRFSA_GetError function to obtain the additional, helpful, error information. The error code you are getting is the 0xbffa4001, or NIRFSA_ERROR_NISCOPE_ERROR. This indicates the error from a digitizer. Obtaining the additional error description (create a buffer with at least 2K, e.g. char buffer[2048];, and pass it to the GetError function) will help you and us to better assist you.

Best regards,
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