ORA-11514
Creating a domain with the same name as an Oracle supplied type, or user defined data type, package or function is not allowed.
Cause
An attempt was made to create a domain with the same name as an Oracle supplied data type, or user defined data type, package, or function in the same schema.
Action
Ensure that the domain name does not coincide with that an Oracle supplied data type or a user defined type, package or function in the same schema.