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error CS0120: An object reference is required for the non-static field, method, or property 'CountdownScript.Countdown()'

You are trying to access a non-static method without an object instance. Non-static methods can only be called on an instance of the class they belong to. In this case, you need to create an instance of the CountdownScript class before calling the Countdown() method. Example: CountdownScript countdownScript = new CountdownScript(); countdownScript.Countdown();