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Powering servo with 4AA

Trying to power a pair of servos with a separate 4AA supply, while running the Arduino through the power jack.

TinkerCAD is giving me an error when running the simulation (shown in the pic), and I don't know why. This simple test circuit is exactly as it appears on YouTube (https://www.youtube.com/watch?v=iBUU-lx-wPM&vl=en), and it works just fine.

Is this an anomaly of the TinkerCAD simulation logic?

T
hanks all.

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