2D Collisions dont work when built.,Colliders not working once built

I’ve been making a 2D platformer. The game works fine in the unity editor, but once i build it, the collisions stop working and my player falls through the floor.,I have been making a 2d platformer, the game works fine in the unity editor. But once I built it, the collisions just stop working and my character falls through the ground. Help??

Provide player controller code

I think you need to check if any tag is removed or has blank