"Your current licence does not include the use of the EA Designer."
The Dashboard Server licence currently being used is not a product edition that includes use of the Enterprise Application (EA) Designer.
Enterprise Application Monitoring (EAM) features are available with the Enterprise Application Monitoring (EAM) edition. To upgrade please contact firstname.lastname@example.org.
For more information about Enterprise Applications (EAs) see Enterprise Applications.
If you have recently upgraded your licence you may need to reactivate the licence for Dashboard Server to pick up the recently added features. See How to reactivate your licence.