Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue

Development Programming & Scripting Blueprint
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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!

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2

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.

3

Solved it! Thank you.

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