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why the start trigger not supported in my counting edge vi

Hello All,
    Please see my attached vi. My goal is to start 2 counter counting simutaneously. A PFI line is used as sampling clock which I will input some pulse train. As my E series DAQ-card doesn't support arm trigger, I have to use two start trigger. but there's error when I run it:
 
Error -200452 occurred at Property Node DAQmx Trigger (arg 1) in DAQmx Start Trigger (Digital Edge).vi->sync counter v2.vi
Possible reason(s):
Specified property is not supported by the device or is not applicable to the task.
Property: Start.TrigType
Task Name: _unnamedTask<E>
 
   Can anybody give me some
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sorry, duplicated unfinished post. please ignore this and see the very first one .
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