Bullet Won't Appear

Hello.
So I tried using the "Fire Bullet" Behavior for my game. The problem is, the bullet won't appear when I try to fire it.
My groups are already arranged. Player group, group for enemies, and another group for the bullet.
My settings for the Fire Bullet Behavior are also complete. Nothing left out.
Oh, the bullet is supposed to kill enemies.
I already tried using the mouse settings and the fire control settings so the bullet would fire. Both didn't work.

In my collision group settings, the bullet doesn't collide with the player. The bullet only collides with the enemy group.
I also attached the attributes for the "Fire Bullet Behavior".
I have searched the 'net several times but to no avail.