Database error when creating a web app instance

I'm trying to setup Project 2013 on SharePoint 2013 and am at the point where you create a Project web app instance. I'm on step 3 on this page.

http://alinimer.com/2013/02/28/install-configure-and-deploy-project-server-2013-part-4/

I'm getting an error saying "Provisioning Failed - see the Application event Log." In the event log it says

Failed to provision site PWA with error: Microsoft.Office.Project.Server.Administration.ProvisionException: Failed to provision database.
Database provisioning failed. The database ProjectWebApp contains a non project schema and cannot be used. ---> Microsoft.Office.Project.Server.Administration.ProvisionException: Database provisioning failed. The database ProjectWebApp contains a non project schema and cannot be used.
   at Microsoft.Office.Project.Server.Administration.PsiServiceApplication.EnsureProjectServiceDatabase(ProjectProvisionSettings provset, String collation, ProjectDatabaseStateType& originalDatabaseState)
   --- End of inner exception stack trace ---
   at Microsoft.Office.Project.Server.Administration.PsiServiceApplication.EnsureProjectServiceDatabase(ProjectProvisionSettings provset, String collation, ProjectDatabaseStateType& originalDatabaseState)
   at Microsoft.Office.Project.Server.Administration.PsiServiceApplication.CreateSite(ProjectProvisionSettings provset)

I'm new to Project Server and fairly new to SharePoint so is this something that's easy to fix? The database was created new for Project.

Free computer help and tips http://www.onlinecomputertips.com