Prefab instance problem. Missing Prefab Asset: 'SpellBook (Missing Prefab with guid: 1a83b4fa032e5494c94ff459ff413fc2)'

Problem detected while opening the Scene file: 'Assets/Scenes/LevelCave001.unity'.

Prefab instance problem. Missing Prefab Asset: 'SpellBook (Missing Prefab with guid: 1a83b4fa032e5494c94ff459ff413fc2)'

Problem detected while opening the Scene file: 'Assets/Scenes/LevelCave002.unity'.

Prefab instance problem. Missing Prefab Asset: 'SpellBook (Missing Prefab with guid: 1a83b4fa032e5494c94ff459ff413fc2)'

Problem detected while opening the Scene file: 'Assets/Scenes/LevelCave000.unity'.

Assets/NavMeshComponents/Scripts/NavMeshLink.cs(127,17): warning CS0618: 'NavMeshLinkInstance.owner' is obsolete: 'owner has been deprecated. Use NavMesh.GetLinkOwner() and NavMesh.SetLinkOwner() instead.'

Assets/NavMeshComponents/Scripts/NavMeshLink.cs(126,17): warning CS0618: 'NavMeshLinkInstance.valid' is obsolete: 'valid has been deprecated. Use NavMesh.IsLinkValid() instead.'

Assets/NavMeshComponents/Scripts/NavMeshBuilder2d.cs(257,17): warning CS0618: 'Collider2D.usedByComposite' is obsolete: 'usedByComposite has been deprecated. Use Collider2D.compositeOperation instead'

Assets/NavMeshComponents/Scripts/NavMeshLink.cs(68,13): warning CS0618: 'NavMeshLinkInstance.Remove()' is obsolete: 'Remove() has been deprecated. Use NavMesh.RemoveLink() instead.'

Assets/NavMeshComponents/Scripts/NavMeshLink.cs(63,13): warning CS0618: 'NavMeshLinkInstance.Remove()' is obsolete: 'Remove() has been deprecated. Use NavMesh.RemoveLink() instead.'

Assets/NavMeshComponents/Scripts/NavMeshLink.cs(56,41): warning CS0618: 'NavMeshLinkInstance.valid' is obsolete: 'valid has been deprecated. Use NavMesh.IsLinkValid() instead.'

Assets/NavMeshComponents/Scripts/CollectSources2d.cs(39,24): warning CS0618: 'Object.FindObjectOfType<T>()' is obsolete: 'Object.FindObjectOfType has been deprecated. Use Object.FindFirstObjectByType instead or if finding any instance is acceptable the faster Object.FindAnyObjectByType'

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Main Object Name 'sun' does not match filename 'Sun'