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Control DAQmx Create Channel (AO_voltage_basic).vi shows error 200099

Upon launching Labview 7.1 code to control a PCI 6229 card Labview software crashes.
Control DAQmx Create Channel (AO_voltage_basic).vi shows error 200099 Physical channel
not specified. I have tried connecting DAQmx Task name constant and DAQmx Global channel
constant with values DEV1/ao0 etc to physical channel of DAQmx Create Channel (AO_voltage_basic).vi
but without success.
 
This problem does not always manifest itself and sometimes the software launches correctly
 
How can I get my program to start all the time?
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