The Schema Wizard stops with a message:
"Unable to write tagged values to repository.
Element = ModelName
key=value schemacreated true.
Error number 3011."
Where 'ModelName' is the name of the UML model in the repository.
The Schema Wizard writes some information to the repository database in the form of tagged values.
If the repository is an Access database, then the file must not be read-only. If the repository is a SQL Server database, the user creating the schema must have write permissions to the database.