You're mixing apples and oranges in a couple different places. First you're acquiring an array a waveforms and trying to wire it to the Get Waveform Components which only accepts a single waveform (i.e. one element of your array). Second, you're trying to extract the Y data (which is an array of points) and use a formula node with a scalar input. I've modified your example to do what I think your're trying to accomplish.
