Oracle Message PLS-00504 - type string_BASE may not be used outside of package STANDARD

ERRORtype string_BASE may not be used outside of package STANDARD
CAUSEIn a declaration, the datatype NUMBER_BASE (for example) was mistakenly specified. The datatypes CHAR_BASE, DATE_BASE, MLSLABEL_BASE, and NUMBER_BASE are for internal use only.
ACTIONSpecify (for example) the datatype NUMBER instead of NUMBER_BASE.