Oracle Solution for Error ora-19206

Solution for Oracle Error ORA-19206

ORA-19206: Invalid value for query or REF CURSOR parameter

What triggered the Error:

e queryString argument passed to DBMS_XMLGEN.newContext was not a valid query, or REF CURSOR.

What should we do to fix it:

write the query so that the queryString argument is a valid query or REF CURSOR.