The present invention provides a compound of Formula (I) or the pharmaceutically acceptable salts, esters, and prodrugs thereof, which are ERK2 inhibitors. The invention also provides a pharmaceutical composition comprising an effective amount of at least one compound of Formula (I) and a pharmaceutically acceptable carrier. The invention also provides a pharmaceutical composition comprising an effective amount of at least one compound of Formula (I) and an effective amount of at least one other pharmaceutically active ingredient (such as, for example, a chemotherapeutic agent), and a pharmaceutically acceptable carrier.