UMG Widget binding casting

Hello,
i just created an actor blueprint for my TestEnemy. It’s a simple cube. I give it a health variable and set it default value to 5.
Now i created a new UMGWidget for the healthbar and a text for the health variable.
Make a binding to the text and cast to my TestEnemy, also make a failed node.
I dont’t know why my cast is failing?
Here are the pictures of my TestEnemy, UMGWidget and the GameLaunch.

Screenshots