Based on the issues raised on appeal, our review is limited to a determination of whether an error of law was committed and whether necessary findings of fact are supported by substantial evidence. Reliable Foods, Inc. v. Workmen's Compensation Appeal Bd. (Horrocks), 660 A.2d 162, 166 (Pa. Commw. 1995). We are also guided by the basic premise that the Workers' Compensation Act is remedial in nature and intended to benefit workers, and therefore, must be liberally construed to effectuate its humanitarian objectives.