This error message means you are trying to connect to a database that does not hold the repository tables. When you first launch Datamaker, it needs to make a connection to the repository tables that we ship with the tool for the product to work. That is usually either an Oracle repository or a SQL Server repository with the name "gtrep" (default name). Once the connection to the repository is established (via the connection profile) you will then be prompted to license the repository if not already activated. After that, you will get a similar page as in first step (connection profiles page). This page is now to make profiles to connect to databases either as source or target. This can be any of your databases.