Message Oracle KUP-04081 - field string used in concatenation for column string is not a character type

ERRORfield string used in concatenation for column string is not a character type
CAUSEThe specified field was part of a concatenation of strings used to create the value for the names column. However, the field was not of a character datatype. Only character fields may be used as part of concatenating fields.
ACTIONVerify the correct field was used in the CONCAT clause. Also verify that the correct datatype is specified for the field in the field list.