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Error: task specified is invalid or does not exist

I am currently using a DaqAssistant to measure temperatures and in my VI program I am able to change the measurement's rate using a text file in my desktop (I can change the rate without accessing to the Daq's parameters). I am also using a task node in order to generate the channels names' table. My problem is that as long as I have this node in my program, I can't change the rate while running it, so I get the error: task specified is invalid or does not exist .

I've tried to delete the node and change the rate and it works perfectly, but I need to keep it in case I later added any channels!

Thank you in advance for your help.

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The solution is to stop using the DAQ Assistant.  Use the actual DAQmx API.  Learn 10 Functions in NI-DAQmx and Handle 80 Percent of Your Data Acquisition Applications

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