When I try to play the game my character keeps falling down through the map's terrain

[DexterDevilArm]

I am a complete beginner, in fact I just started using unity today and I am having this strange problem that when ever I try to play the game I created [ in first person mode ] my character keeps falling through the map’s terrain and I keep sinking down into nowhere. Please help.

[Gurc]

Did you add CharacterCollider to your character?

[GreatBigJerk]

Make sure there’s a collider attached to the ground.

[rickburgen]

make sure that you aren’t using two mesh colliders!

[J_Ripley]

I am having the same problem as I have Mesh Colliders on everything except the Player. The Player parent has Character Controller which surrounds the Child or Soldier, but soldier gets stuck half way through the terrain. Picture attached.