How do i play an animation on key press?

So i have the fps template, removed the hand & gun and imported my own, how can i make it so when i hold W the walk animation plays and when it gets released it stops and fades back to idle?

I tried doing this but it wouldnt play
My Blueprint:

This is what happen when i press W ( and the model goes to the default state without animations with arms going to the sides)

I think you would have more luck using play animation rather than the set animation in that set up and have run set to press and the idle set to release.
You could also make a idle/run blend space in your character anim blueprint and control it from there.