Could not connect to Project Web App. This could be because there is no Project Web App specified for this site. Contact ...

Could not connect to Project Web App.  This could be because there is no Project Web App specified for this site.  Contact your server administrator to set a default Project Web App URL for the "{0}" web part.  If you have manually changed the Project Web App URL for this web part, please remove the web part and add it to the page again from the web part catalog.