How can I fix this "NullReferenceException: Object reference not set to an instance of an object Door.PlayLockedDoorSound () (at Assets/Scripts/Door.cs:34) Door.ChangeDoorState () (at"

Object reference not set to an instance of an object : how to fix

NullReferenceException: Object reference not set to an instance of an object PlayerMovement.FixedUpd

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Self Referential and Nested Structures in C | Free Video Tutorial | Udemy

Advanced C#: Object-Oriented Programming