ERROR: ORA-00923: FROM keyword not found where expected

ora 923ORA-00923: FROM keyword not found where expected SQL: SELECT DISTINCT B10.EMPLID from PS_BEN_PROG_PARTIC a10, PS_EMPLOYEES b10,The ORA-00923: FROM keyword not found where expected error occurs when the FROM keyword is missing, misspelled, or misplaced in the Oracle SQL statement such as select or