We do various kinds of Karam (actions) as we go through our life. The only thing beyond Karam (action) is Naam Japna. All other actions create Karam, the only action that does not create Karam and wipes away all other Karam is Naam Japna (Chanting Vaheguru's Name). So, Naam Japna is the solution to sin. We start to wipe out our sins by doing Naam Japna.