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Outputting a pulse train and reading pulse width using NI myDAQ

I'm having some problems outputting a pulse train and reading pulse width. When attempting to do this I am using "CRT 0"(as it is my only option) for both my counter and physical channel when I attempt to run the code I recive an error that says. 

 

"Possible reason(s):
 
The specified resource is reserved. The operation could not be completed as specified.
 
Task Name: _unnamedTask<8EB5>"
 
I'm not sure if this means that I cannout use CRT 0 for both my wave ceation and measurement  even though they use diffrent physical channels(DIO 1 for the width and DIO 3 for the train). Any help with this would be great.
Thanks, Ryan
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