Oracle Message ORA-06559 - wrong datatype requested, string, actual datatype is string

ERRORwrong datatype requested, string, actual datatype is string
CAUSEThe sender put different datatype on the pipe than that being requested (package dbms_pipe). The numbers are: 6 - number, 9 - char, 12 - date.
ACTIONCheck that the sender and receiver agree on the number and types of items placed on the pipe.