If you check the output, does it say anything? If so, what line is it?
Do not place the script inside the Humanoid rootpart but in the character instead since there is no Humanoid in the HumanoidRootPart also make sure you are using a ServerScript.
the rig is the Model of the character. When u click the button to create a character, usually the name of the model is Dummy. Its a group of parts
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