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Behavior Tree Quick Start Guide Not Working?

I completed the entire Behavior Tree Quick Start Guide from the documentation, but the PatrolLocation is always <invalid>. I checked and re-checked everything, but I cannot figure out why this is happening. The AI also never chases the player because the HasLineOfSite key is always false. Any ideas on what I might have messed up on?

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I fixed the HasLineOfSight issue, and this topic shows how to fix the invalid key problem. I don’t get why the documentation doesn’t say more about assigning the PatrolLocation variable though…