Oracle Message ORA-08452 - specification of E in picture mask is unsupported

ERRORspecification of E in picture mask is unsupported
CAUSEThe floating point exponent symbol E was specified in the picture mask parameter passed to a UTL_PG conversion routine. The floating point data type is currently not supported by the UTL_PG conversion routines.
ACTIONCorrect the picture mask parameter, and the data, if necessary.