So, I learned something today and wanted to post this in the case that someone else did this too.
Problem:
Prior to Unreal 4.5 I would have the actions of a timeline in the Event Graph of a blueprint but call a timeline within a separate function and have no issues whatsoever. Like so:
Then with 4.5 that was calling an error and the Timeline was not considered valid.
Solution:
So, instead I now call a custom event that ties back to the timeline put into the Event Graph and can get the right direction and actions taken
Maybe obvious to some, but I had to learn it the hard way. Hope this helps!