FM MOD/ DEMOD PROBLEM

[hby01]

Hey guys I am new to this forum and I am really need someone to help me out with my problem: I am required to build a vi that contains both an fm transmitter and receiver where the transmitter reads a number of voice samples and the receiver selects one sample based on carrier frequency and demodulates it. Each time I try to run the vi I get an error code -21837 in both the upconvert and downconvert vi's. Any help would be much appreciated.

[JÞB]

The error code you are seeing indicates that the input waveform has no samples.  (The information contained in "Nothing" contains no information by definition so, the error is properly thrown) 

You did not attach "ReadSound.vi" and that vi is likely outputting an empty waveform.