error with external behaviors

I decided to use a heavily modified version of the Nolan demo behavior for my project. unfortunately, this causes an error where the play audio source task I placed in the behavior returns an error "the task play has a field which is referencing an object within the scene. behavior tree variables at the project level cannot be referenced in a scene. This error does not pop up in my previously created behavior (which was a carbon copy of the demo task) is there any fix for this?

Screenshot (16).png
 
You can fetch the reference dynamically at runtime. Take a look at this page:

 
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