Setup the new project with the Project Path defined as '/OMOP'.
Additional Resource / Instructions: The standard i2b2 Installation Guide provides additional information on how to setup and manage Projects in the i2b2 Admin Module.
In order for the CRC to run queries, the agg_service_account has to have access to the new project you just created. Make sure you add this user to your project before trying to run a query. For information on how to add a user to a project please see the Project Users chapter of the i2b2 Installation Guide.