Oracle Message ORA-14012 - resulting partition name conflicts with that of an existing partition

ERRORresulting partition name conflicts with that of an existing partition
CAUSEName of a partition resulting from splitting of an existing table or index partition is identical to that of some other existing partition of that table or index
ACTIONrename resulting partition(s) to ensure that their names are distinct and different from those of any other partition of the table or index