i am using Unreal Engine 4.8, funny things is the Service is not instanced for every behaviour tree that run on the world. it’s like when i have more than one actor on the world, that use the service. the one that tick the service is the last actor. it’s really is funny… ( or there is some way to make it instanced for every behaviour tree??)
ups, i forget to set bCreateNodeInstace to true. silly me… 