User-centric error messaging on AB test tools

[SeanAdams]

Currently working through an assignment on the Udacity Nano-degree related to A/B testing (thank you for the great course content @PatrickN ) 

Unfortunately - when using the AB testing tools for the first time, I encountered several cryptic error messages.   

This request is not to help diagnose this error message, but rather to wrap these error messages in a way that gives users some useful info so that they can solve this problem themselves.

As you can see from the error message below - the error provided does not give the user any hints on how to go about fixing the problem.

I've attached the workflow with embedded data so this should be replicatable

ABTestError.yxmd

[SeanAdams]

In this case, the error message should be "the D input must contain all units including the test units"

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