about the example error

Hello
I’m a university student in department of Information Management.
I have a project about my school’s salary information system used database from Oracle to tamino server.I use the example schema and data in Tamino Documentation “Tamino schema definition / Representing Joins” to test doctype join.But I can’t get the correct result.There was a error dialog without any message or error code when I tried to get schema that I had defined.