Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue

Development Programming & Scripting Blueprint
, , ,
1

I was trying to get zombie AI into my game by following this tutorial:
but I got an error saying: Error Blueprint Runtime Error: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue from function: ‘ExecuteUbergraph_ZombieBehaviour’ from node: Set Value as Bool in graph: EventGraph in object: ZombieBehaviour with description: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue.

After looking around it seems the the blueprint can’t access the blackboard, nut I am unsure how to fix the issue.
Thanks!

237589-unrealimg1.png
237589-unrealimg1.png1280×720 224 KB

2

Solved it! Thank you.

3

Did you ever put in a node called “Run Behavior Tree”?? I know that seems like a silly thing to ask but I don’t have the blueprint in front of me so just want to cover all basis.

1 Like
4

It’s always nice when it’s something little ha

5

and what was the answer?..

6

Pretty sure there was no “Run Behavior Tree” node.

7

ah ok - thanks