Message Oracle PLS-01450 - This contains a nonconforming data type

ERRORThis contains a nonconforming data type
CAUSEThis contains a nonconforming data type. Section 4.2 of X3H2, Data types states that: A nonnull value is either a character string or a number. Many builtin functions in STANDARD will be flagged with this warning by means of a pragma.
ACTIONNone