Black screen when I use while event

This is my first game in construct 2, read a few of the tutorials here. Have been using rpgmaker for years now.

When ever I use this while event the screen is completely black when run. But other wise it is exactly as it should be.

Score variable is 0 in the beginning.

rpgmaker.net/media/content/users/24515/locker/Untitled.png

C2 already runs in a loop, so you don't want to use While. Try "Every 3 seconds" with your conditions under that instead.