Oracle Solution for Error ora-32311

ORA-32311: materialized view definition query selects an unsupported user-defined type

What triggered the Error:

An attempt was made in the definition query to select an embedded user-defined type, function returning a user-defined type, or a function whose arguments are user-defined types.

What should we do to fix it:

Rewrite the definition query to exclude these unsupported user-defined types.