Most likely you are just missing an actor on the effect.
Open the Actor tab. Since it is artillery I think the siege tank attack might be a good choice, so find “Siege Tank Sieged Attack” and copy it.
Up at the top in the “Tokens” section change the “Attack Effect” to be the effect you created for the ability. If "Attack Effect" doesn't work, try the "Impact Effect".
Hope this helps.
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Most likely you are just missing an actor on the effect.
Hope this helps.