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DTMF in Labview

Hi all,

 

   I'm currently working on a project in which I'm trying to get labview to graph a frequency domain graph where I input a signal through a website thats generates the dual tone. However I'm having issues in " filtering" with the Filter VI. The error shows to be " SubVi is no executable" and

 

The subVI is not executable. You must fix all errors in the subVI before this VI can run.

 

Without the Filter VI it works, however with it attached it doesn't. Does anyone know where I am going wrong on this?

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