Error when start and when AI agents spawned

[nRedux]

Surely, I've set something up wrong. Any ideas?

NullReferenceException: Object reference not set to an instance of an object
Opsive.UltimateCharacterController.Items.Item.IsActive () (at Assets/Opsive/UltimateCharacterController/Scripts/Items/Item.cs:620)
Opsive.UltimateCharacterController.Items.Item.set_ShowFullScreenUI (System.Boolean value) (at Assets/Opsive/UltimateCharacterController/Scripts/Items/Item.cs:134)
Opsive.UltimateCharacterController.Items.Item.Equip (System.Boolean immediateEquip) (at Assets/Opsive/UltimateCharacterController/Scripts/Items/Item.cs:466)
Opsive.UltimateCharacterController.Inventory.InventoryBase.EquipItem (Opsive.UltimateCharacterController.Inventory.ItemType itemType, System.Int32 slotID, System.Boolean immediateEquip) (at Assets/Opsive/UltimateCharacterController/Scripts/Inventory/InventoryBase.cs:360)
Opsive.UltimateCharacterController.Character.Abilities.Items.EquipUnequip.OnPickupItem (Opsive.UltimateCharacterController.Items.Item item, System.Single count, System.Boolean immediatePickup, System.Boolean forceEquip) (at Assets/Opsive/UltimateCharacterController/Scripts/Character/Abilities/Items/EquipUnequip.cs:213)
Opsive.UltimateCharacterController.Events.InvokableAction`4[T1,T2,T3,T4].Invoke (T1 arg1, T2 arg2, T3 arg3, T4 arg4) (at Assets/Opsive/UltimateCharacterController/Scripts/Events/InvokableAction.cs:225)
Opsive.UltimateCharacterController.Events.EventHandler.ExecuteEvent[T1,T2,T3,T4] (System.Object obj, System.String eventName, T1 arg1, T2 arg2, T3 arg3, T4 arg4) (at Assets/Opsive/UltimateCharacterController/Scripts/Events/EventHandler.cs:522)
Opsive.UltimateCharacterController.Inventory.InventoryBase.ItemTypePickup (Opsive.UltimateCharacterController.Inventory.ItemType itemType, System.Single count, System.Int32 slotID, System.Boolean immediatePickup, System.Boolean forceEquip) (at Assets/Opsive/UltimateCharacterController/Scripts/Inventory/InventoryBase.cs:277)
Opsive.UltimateCharacterController.Inventory.InventoryBase.PickupItemType (Opsive.UltimateCharacterController.Inventory.ItemType itemType, System.Single count, System.Int32 slotID, System.Boolean immediatePickup, System.Boolean forceEquip, System.Boolean notifyOnPickup) (at Assets/Opsive/UltimateCharacterController/Scripts/Inventory/InventoryBase.cs:222)
Opsive.UltimateCharacterController.Inventory.InventoryBase.PickupItemType (Opsive.UltimateCharacterController.Inventory.ItemType itemType, System.Single count, System.Int32 slotID, System.Boolean immediatePickup, System.Boolean forceEquip) (at Assets/Opsive/UltimateCharacterController/Scripts/Inventory/InventoryBase.cs:194)
Opsive.UltimateCharacterController.Inventory.InventoryBase.LoadDefaultLoadout () (at Assets/Opsive/UltimateCharacterController/Scripts/Inventory/InventoryBase.cs:134)
Opsive.UltimateCharacterController.Inventory.InventoryBase.Start () (at Assets/Opsive/UltimateCharacterController/Scripts/Inventory/InventoryBase.cs:119)

 

[Justin]

What steps did you take to get that error? It looks like the item hasn't been initialized.

 

[nRedux]

Set up my player character.
Just created a simple AI agent.
Added a weapon (item) third person only. Hit play.

The same error can be seen in the behaviordesigner integration first person demo scene.

 

[nRedux]

The issue happens when in Item.IsActive() it attempts to call m_ActivePerspectiveItem.IsActive(), and m_ActivePerspectiveItem is null. As for why that is, you're right, it's probably not initialized somehow? How that comes to pass is above my pay grade atm.

 

[nRedux]

Item.Start, here I see it trying to assign m_ActivePerspectiveItem, but in this case, when at line ~315 it checks m_CharacterLocomotion.FirstPersonPerspective and instead of assigning the m_ThirdPersonPerspectiveItem to the m_ActivePerspectiveItem, it chooses
m_FirstPersonPerspectiveItem.

Not sure if this helps, but something with the movement type being set up wrong? Tried looking but I don't much understand how the system works.

[edit]
this seems like an issue as I didn't set up anything first person on the agent, so perhaps it's attempting to utilize objects which don't exist as a result?

 

[Justin]

this seems like an issue as I didn't set up anything first person on the agent, so perhaps it's attempting to utilize objects which don't exist as a result?

Ah, yes, that would case it. For AI characters you only need to setup a third person perspective.

 

[nRedux]

That's what I did, I only set up third person items. The BD shooter demo scene does throws the same error.

 

[Justin]

Good catch. You can fix this by changing line 315 within Item.cs from:

            if (m_CharacterLocomotion.FirstPersonPerspective

to:

            if (m_CharacterLocomotion.FirstPersonPerspective && m_FirstPersonPerspectiveItem != null

You'll then get an error indicating the movement type doesn't match but I'll upload a new Behavior Designer integration package that has it fixed (this relates to how I am building those scenes).

 

[Belphegore]

I was getting the same error with the same steps, your new code did the trick! Thanks Justin!