Specified operation cannot be performed while the task is running. Task Name: ClockTriggerBit

I am trying to set the timing for digital line on 6221. As recommended in the documentation "NI DAQ MX C reference guide" I stop the task, run the following:
DAQmxCfgOutputBuffer
DAQmxCfgSampClkTiming (taskHandle, "ao/SampleClock", 100, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 10);
DAQmxWriteDigitalLines
DAQmxStartTask -> this is when I get the warning 4294766817. Why?
Any better way to set the sample clock? I need to do it using internal clock in 6221.
Thank You,
Mark.

Hello Metrikos,
I've got a couple things.  First, could you be more specific as to where in the DAQmx C Reference Help you are referring to.  Secondly, attached is an example of corellated digital input with analog input.  I know this isn't exactly what you are trying to do, but it might give you a good reference. 
-Alan A.
Attachments:
ContAI-ReadDigChan.c ‏6 KB

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