What is the Karna Chariot wheel curse?

Karna once helped a small child when she had spilled milk on the ground and feared beating her mother. A kind Karna jumped into the situation and twisted the ground and hence the mother Earth. Mother Earth was engaged and had to suffer unbearable pain and cursed Karna that she would not help him and instead would attempt to make him lose in the battle whenever the opportunity arose. It is how his chariot wheel got stuck in the Earth.