Why is my Behavior Tree missing?

Development Programming & Scripting
1

For one strange reason the whole behavior tree option is gone for me.
Had the problem in 4.3 and 4.3.1

Reinstalled unreal engine completly and still no change, doenst work both of my computers and even with new projects im missing the behaviour tree options in the blueprint maker.

error log:

Error /Game/Blueprints/AI/BTS_AI_TREE : Can't find file for asset. /Game/Blueprints/AI/BTS_Data
Error /Game/Blueprints/AI/BTS_AI_TREE : Can't find file for asset. /Game/Blueprints/AI/BTD_Update_route
Error Failed import: BlueprintGeneratedClass /Game/Blueprints/BotWaypoint.BotWaypoint_C  in /Game/Blueprints/AI/BTT_Next_Route
Error Failed import: IntProperty /Game/Blueprints/BotWaypoint.BotWaypoint_C:postition  in /Game/Blueprints/AI/BTT_Next_Route
Error /Game/Blueprints/AI/AI_Robber : Can't find file for asset. /Game/Character/HeroTPP_AnimBlueprint
Error /Game/Blueprints/AI/BTS_AI_Controller : Can't find file for asset. /Script/BehaviorTreeEditor
Error /Game/Blueprints/AI/BTS_AI_Controller : Can't find file for asset. /Game/Blueprints/AI/BTD_Update_route
Info Failed to load /Game/Blueprints/AI/BTS_AI_Controller.BTS_AI_Controller_C Referenced by EdGraphPin_1581 Property /Script/Engine.EdGraphPin:DefaultObject
Info Failed to load /Game/Blueprints/AI/BTS_AI_Controller.BTS_AI_Controller_C Referenced by Default__AI_Robber_C Property /Script/Engine.SkeletalMeshComponent:AnimBlueprintGeneratedClass
Error /Game/Blueprints/AI/BTS_AI_Controller : Can't find file for asset. /Game/Character/HeroTPP_AnimBlueprint
Info Failed to load /Game/Blueprints/AI/BTS_AI_Controller.BTS_AI_Controller_C Referenced by Default__AI_Robber_C Property /Script/Engine.SkinnedMeshComponent:SkeletalMesh
Error /Game/Blueprints/AI/BTS_AI_Controller : Can't find file for asset. /Game/Character/HeroTPP
Error /Game/Blueprints/AI/AI_Robber : Can't find file for asset. /Game/Character/HeroTPP
Error /Game/Blueprints/AI/BTS_AI_TREE : Can't find file for asset. /Script/BehaviorTreeEditor
Info Failed to load /Script/BehaviorTreeEditor.BehaviorTreeGraph Referenced by BTS_AI_TREE Property /Script/AIModule.BehaviorTree:BTGraph
Info Failed to load /Script/BehaviorTreeEditor.BehaviorTreeGraph Referenced by BTS_AI_TREE Property /Script/Engine.Blueprint:EditedDocumentInfo.EditedObject
Info Failed to load /Game/Blueprints/AI/BTS_Data.BTS_Data Referenced by BTS_AI_TREE Property /Script/AIModule.BehaviorTree:BlackboardAsset
Info Failed to load /Game/Blueprints/AI/BTD_Update_route.BTD_Update_route_C Referenced by BTComposite_Selector_1 Property /Script/AIModule.BTCompositeNode:BTCompositeChild.Decorators
Error /Game/Blueprints/AI/BTT_Next_Action_Point : Can't find file for asset. /Game/Blueprints/AI/AI_NavPoints
Info Failed to load /Game/Blueprints/AI/AI_NavPoints.AI_NavPoints_C Referenced by EdGraphPin_2474 Property /Script/Engine.EdGraphPin:DefaultObject
Info Failed to load /Game/Blueprints/AI/AI_NavPoints.AI_NavPoints_C Referenced by K2Node_DynamicCast_224 Property /Script/BlueprintGraph.K2Node_DynamicCast:TargetType
Info Failed to load /Game/Blueprints/AI/AI_NavPoints.AI_NavPoints_C Referenced by EdGraphPin_15648 Property /Script/Engine.EdGraphPin:PinType
Error /Game/Blueprints/AI/BTS_Update_State : Can't find file for asset. /Game/Blueprints/AI/BTS_State
Info Failed to load /Game/Blueprints/AI/BTS_State.BTS_State Referenced by K2Node_SwitchEnum_2440 Property /Script/BlueprintGraph.K2Node_SwitchEnum:Enum
2

Same thing happened to me. I was forced to recreate my Waypoint and Behavior Tree after an update.

3

Did you check Edit->Edit Preferences->Experimental->Behavior Tree Editor ?

4

Seems that somewhere in the project stuff went wrong, ive replaced the whole project with an older one and that solved the problem.

Will try and see what went wrong in the old one.

5

Indeed for one strange reason the option got deselected.