Previewing and fixing errors as they appear

Now that you have completed the design of the Transformation, let's run some previews:

  1. Select the UDJE step and run a preview. You already know how to do it: click on the Preview icon in the Transformation toolbar and then click on Quick Launch. You'll see the following screenshot:
Errors while previewing a Transformation

Something is wrong. A pop-up window tells us that there are no rows to preview, but we can also see that an error has occurred. We know that because:

  • The background of the Calculator row in the Step Metrics tab changed to red (highlighted)
  • The border of the Calculator step also ...

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