[42000][923] Ora00923: From Keyword Not Found Where Expected

ora 923I have been getting the error ORA-00923: FROM keyword not found where expected and do not know why, please help. Do check for missing spaces in the sql query. I ran into anotherORA-00923: FROM keyword not found where expected SQL: SELECT DISTINCT B10.EMPLID from PS_BEN_PROG_PARTIC a10, PS_EMPLOYEES b10,