Opening JDBC connection to Some(databaseName=db) failed with SQLState: 08 Error code: -1 Message: Could not connect to address=(host=databaseName=db)(port=3306)(type=master) : databaseName=db, giving up...(4/4)
To me the error message is clear. The modeler is unable to communicate with your database. The reason why we can not help you with. You could check things like firewall, another model already open that uses the same setup, database not running etc.