Stars Buddy Search (new AHK script)

[Bowlboy]

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What does this mean?

Error: The same variable cannot be used for more than one control per window. The current thread will exit.

Specifically: v1

Line#
---> 323: Gui,Add,Button,v%a_index% ym gOpen,Open Tables

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I have no idea. I got the same thing two twice but each time I closed AHK and reopened it and it worked fine again.