When importing table that contained custom type, you will encounter an oracle error as shown below:
Import of table containing object type(s) fails with IMP-00061 IMP-00063

cause:
When you import a table that references a type, but a type of that name
already exists in the database. Import attempts to verify that the pre-existing
type is in fact the type used by the table(rather than a different type that
just happens to have the same name).