AI Documentation Question

Hey There!

I was going through following the Unreal Documentation for artificial intelligence,
and followed everything to a ‘T’. Pressed play and it still wouldn’t work,
so i went back through and checked everything. Still didn’t work.
SO… I deleted all of it and started over completely. Still nothing.
When i press Play the behavior tree shows that the blackboard based condition
with the selector has a red line on the right side, and the same for the ‘Is At Location’
on the sequence side. Does anyone know why this would be happening? I thought
maybe the version that the documentation is in, and my current engine version could have something to
do with it, but I’m not too sure.

Thanks,
Austin