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Game Development Object-Oriented Programming in Unity Interfaces Preparing for Interfaces

i also have a problem with this one UNITY object oriented

this error: Assets/Scripts/ArrowCollision.cs(10,30): error CS1061: Type UnityEngine.GameObject' does not contain a definition forGetCompoenent' and no extension method GetCompoenent' of typeUnityEngine.GameObject' could be found. Are you missing an assembly reference?

someone please help me

Did you type other.gameObject or other.GameObject ? The G in gameObject has to be in lower case.