Overlapping Audio called on in AI Controller BP(UE4 - v4.26.2)

Hello again! So I hooked up everything the way you showed, and the sound cue plays the ambient track but when seen it will not play the battle track, I am at a bit of a loss and I also have been getting this runtime error:

Thank you so much for your reply! I feel like this I am very close to actually getting this to work, just something is causing it to only play the ambient sound track and it never switches to the battle track it just loops. I am probably missing something very obvious I just can’t see what it could be atm.

Thanks again for all your help!

P.S. Currently as a new user I cannot post more than 1 embedded media item so if you’d like me to share the BP I wrote does anyone know how I can share that without making multiple replies?

EDIT: I went through the tutorial again and when do you use the CrossFade param Duration? I cant see it being called or used anywhere.

EDIT 2: Okay so in the Use Blackboard node in the AI Controller I didn’t have that set, so I set that and I changed the interp to the correct 1 and 0.001. Still the ambient track plays (track 1) but track 2 will not play at all once the AI spots the player it just gives chase, I am not quite sure whats going on here.

What I do notice is that when playing the game and viewing the MasterSound_BP in the BP editor is that the battle music timeline never triggers and remains paused even when seen by the pawn. Not sure if that is helpful or not though.