The most likely cause of this error is that the GameGui object has not been initialized. You need to make sure that the GameGui object has been initialized and assigned a value before calling the WorldToScreen method. Additionally, you may need to add the 'static' keyword to the WorldToScreen method declaration, as this will make the method accessible without requiring an instance of GameGui.

You can find more information on the topics of object initialization and static methods in the official Microsoft documentation
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