Fix the Most CommonUnity Errors Like a Pro

05. Unassigned Reference Exception

🟡 Runtime / Inspector Error

You declared a public or [SerializeField] variable and Unity is calling it — but you forgot to drag-and-drop the reference in the Inspector. It’s basically a Null but Unity gives you a more specific message.

UnassignedReferenceException: The variable spawnPoint of SpawnManager has not been assigned.You probably need to assign the spawnPoint variable of the SpawnManager script in the inspector. SpawnManager.SpawnEnemy () (at Assets/Scripts/SpawnManager.cs:19)

1. Select the GameObject in the Hierarchy that has this script.
2. In the Inspector, find the script component.
3. Look for the empty field (shown as “None (Transform)” or similar).
4. Drag the correct GameObject or Component into that field.

💡 Pro Tip
Use [RequireComponent(typeof(Rigidbody))] above your class to force Unity to auto-attach required components — preventing this class of error entirely.