Actor Sequence error after compile

So I was trying to figure out how to use Actor Sequences so I could trigger some conversation animations inside my NPC blueprint. I was following the documentation just as a test… Actor Sequence Component | Unreal Engine Documentation
Unfortunately it seems that after compiling the Actor Sequence gets an error and it no longer allows you to add tracks etc. For example I can no longer adjust elements of the light component. It still plays fine inside the level, but I can’t make any further adjustments. I also tried triggering animations and this just doesn’t work at all.

Any ideas what the problem might be?