You omit the UNDO tablespace clause in your CREATE DATABASE statment. The UNDO_MANAGEMENT parameter is set to AUTO. What is the result of your CREATE DATABASE statement ?
The oracle server creates no undo tablespace.
The oracle server creates an undo segment in the system tablespace.
The oracle server cerates one undo tablespace with the name SYS_UNDOTBS.
Database creation fails because you did not specify an undo tablespace on the create database statment.