Can't create spiral between elements, invalid geometry type PRT SS4

I have drawn two "Lines Between Points" that are at a right angle to eachother and are able to create a spiral

I select "Spiral Between Two Elements", can select one element, when I go to select the second, it says "Invalid Geometry Type"

Weird thing is, I can select a curved portion of a reverse  curve I created previously.

Earlier in this session it let me do it, and I do not recall messing with any settings.

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