Oracle Message NCR-02004 - NCRF: Invalid format interpreter type context

ERRORNCRF: Invalid format interpreter type context
CAUSEThe format interpreter was given an invalid type context.
ACTIONThis error usually happens due to an improperly described aggregrate. For example, declaring NCRF_END_STRUCT_DATA_TYPE within a context, without a complementary NCRF_STRUCT_DATA_TYPE, is invalid.