I want to know under what conditions this error occurs in Verse.

Development Programming & Scripting Verse
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5

ReturnTan has “transacts”. Could this be the problem?

ReturnTan(T1 : transform,T2 : transform)<transacts>:float=
        Angle := ArcTan(T2.Translation.Y - T1.Translation.Y,T2.Translation.X - T1.Translation.X)*180/PiFloat
        return Angle