RecruitingPhase 1Biological interventionUCB Transplant of Inherited Metabolic Diseases With Administration of Intrathecal UCB Derived Oligodendrocyte-Like CellsThe primary objective of the study is to determine the safety and feasibility of intrathecal administration of DUOC-01 in patients who are undergoing standard treatment with umbilical cord blood transplant (UCBT) for inborn errors of metabolism and who have evidence of early demyelinating disease in the central nervous system (CNS). The secondary objective of the study is to describe the efficacy of UCBT with intrathecal administration of DUOC-01 in these patients.