<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_mtllibs(self):
 """Load mtl files"""

        for mtllib in self.meta.mtllibs:
            try:
                materials = self.material_parser_cls(
                    os.path.join(self.path, mtllib),
                    encoding=self.encoding,
                    strict=self.strict).materials
            except IOError:
                raise IOError("Failed to load mtl file:".format(os.path.join(self.path, mtllib)))

            for name, material in materials.items():
                self.wavefront.materials[name] = material