Bug in collision detection

THE collision detection was working when I closed the unreal editor and restarted the engine after replacing the starter contents the opening and closing of door is working .But the door is not blocking th third person character.
Please help.

here is the image.

Hi guys ! Looks like I figured out the problem .A similar problem had occured and a staff member had helped .This is the solution
You will need to either add collision through the Collision tab at the top or go to the Details panel > Static Mesh Settings > Collision Complexity > set it to ‘Use Complex Collision As Simple’.