ArgumentNullException: Value cannot be null.
Parameter name: key
System.Collections.Generic.Dictionary`2[TKey,TValue].FindEntry (TKey key) (at <7b935204f5ff4bcab44b3b0ebca330bf>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].TryGetValue (TKey key, TValue& value) (at <7b935204f5ff4bcab44b3b0ebca330bf>:0)
Opsive.Shared.Game.GameObjectExtensions.GetCachedParentComponent[T] (UnityEngine.GameObject gameObject) (at <6b6b48297d4f49e9ba244a49e70e6e92>:0)
Opsive.Shared.StateSystem.StateManager.InitializeInternal (UnityEngine.GameObject stateGameObject, Opsive.Shared.StateSystem.IStateOwner owner, Opsive.Shared.StateSystem.State[] states) (at Assets/Opsive/Shared/StateSystem/StateManager.cs:89)
Opsive.Shared.StateSystem.StateManager.Initialize (UnityEngine.GameObject gameObject, Opsive.Shared.StateSystem.IStateOwner owner, Opsive.Shared.StateSystem.State[] states) (at Assets/Opsive/Shared/StateSystem/StateManager.cs:65)
Opsive.Shared.StateSystem.StateObject.Initialize (UnityEngine.GameObject gameObject) (at Assets/Opsive/Shared/StateSystem/StateObject.cs:29)
Opsive.UltimateCharacterController.Items.Actions.Magic.CastActions.CastAction.Initialize (UnityEngine.GameObject character, Opsive.UltimateCharacterController.Items.Actions.MagicItem magicItem, System.Int32 index) (at Assets/Opsive/UltimateCharacterController/Scripts/Items/Actions/Magic/CastActions/CastAction.cs:40)
Opsive.UltimateCharacterController.Items.Actions.Magic.CastActions.SpawnParticle.Initialize (UnityEngine.GameObject character, Opsive.UltimateCharacterController.Items.Actions.MagicItem magicItem, System.Int32 index) (at Assets/Opsive/UltimateCharacterController/Scripts/Items/Actions/Magic/CastActions/SpawnParticle.cs:107)
Opsive.UltimateCharacterController.Items.Actions.MagicItem.DeserializeCastActions (System.Boolean forceDeserialization) (at Assets/Opsive/UltimateCharacterController/Scripts/Items/Actions/MagicItem.cs:329)
Opsive.UltimateCharacterController.Editor.Inspectors.Items.Actions.MagicItemInspector.OnEnable () (at Assets/Opsive/UltimateCharacterController/Editor/Inspectors/Items/Actions/MagicItemInspector.cs:61)
hope it helps