Oracle Message ORA-14308 - partition bound element must be one of: string, datetime or interval literal, number, or NULL

ERRORpartition bound element must be one of: string, datetime or interval literal, number, or NULL
CAUSEPartition bound list contained an element of invalid type (i.e. not a number, non-empty string, datetime or interval literal, or NULL)
ACTIONEnsure that all elements of partition bound list are of valid type