Why does my example program fail on DAQmxCreateTask?

system:
HW: NI USB-9263 DAC
driver NI-DAQmx 8.9.5
OS: Windows 7

connectivity:

Using the Measurement & Automation Explorer
I see NI USB-9263:"Dev1" under NI-DAQmx Devices

When I run the test application, VoltUpdate.c, it fails
when DAQmxCreateTask is called.

the complete example follows:

/*********************************************************************
*
* ANSI C Example program:
*    VoltUpdate.c
*
* Example Category:
*    AO
*
* Description:
*    This example demonstrates how to output a single Voltage Update
*    (Sample) to an Analog Output Channel.
*
* Instructions for Running:
*    1. Select the Physical Channel to correspond to where your
*       signal is output on the DAQ device.
*    2. Enter the Minimum and Maximum Voltage Ranges.
*    Note: Use the Acq One Sample example to verify you are
*          generating the correct output on the DAQ device.
*
* Steps:
*    1. Create a task.
*    2. Create an Analog Output Voltage Channel.
*    3. Use the Write function to Output 1 Sample to 1 Channel on the
*       Data Acquisition Card.
*    4. Display an error if any.
*
* I/O Connections Overview:
*    Make sure your signal output terminal matches the Physical
*    Channel I/O Control. For further connection information, refer
*    to your hardware reference manual.
*
*********************************************************************/

/*********************************************************************
* Microsoft Windows Vista User Account Control
* Running certain applications on Microsoft Windows Vista requires
* administrator privileges, because the application name contains keywords
* such as setup, update, or install. To avoid this problem, you must add an
* additional manifest to the application that specifies the privileges
* required to run the application. Some ANSI-C NI-DAQmx examples include
* these keywords. Therefore, these examples are shipped with an additional
* manifest file that you must embed in the example executable. The manifest
* file is named [ExampleName].exe.manifest, where [ExampleName] is the
* NI-provided example name. For information on how to embed the manifest
* file, refer to http://msdn2.microsoft.com/en-us/library/bb756929.aspx.
*********************************************************************/

#include <stdio.h>
#include <NIDAQmx.h>

#define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else

int main(void)
{
    int            error=0;
    TaskHandle    taskHandle=0;
    char        errBuff[2048]={'\0'};
    float64     data[1] = {1.0};

    /*********************************************/
    // DAQmx Configure Code
    /*********************************************/
    DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
    DAQmxErrChk (DAQmxCreateAOVoltageChan(taskHandle,"Dev1/ao0","",-10.0,10.0,DAQmx_Val_Volts,""));

    /*********************************************/
    // DAQmx Start Code
    /*********************************************/
    DAQmxErrChk (DAQmxStartTask(taskHandle));

    /*********************************************/
    // DAQmx Write Code
    /*********************************************/
    DAQmxErrChk (DAQmxWriteAnalogF64(taskHandle,1,1,10.0,DAQmx_Val_GroupByChannel,data,NULL,NULL));

Error:
    if( DAQmxFailed(error) )
        DAQmxGetExtendedErrorInfo(errBuff,2048);
    if( taskHandle!=0 ) {
        /*********************************************/
        // DAQmx Stop Code
        /*********************************************/
        DAQmxStopTask(taskHandle);
        DAQmxClearTask(taskHandle);
    }
    if( DAQmxFailed(error) )
        printf("DAQmx Error: %s\n",errBuff);
    printf("End of program, press Enter key to quit\n");
    getchar();
    return 0;
}