The load test results database could not be opened. Check that the load test results database specified by the connect string ...

The load test results database could not be opened.  Check that the load test results database specified by the connect string for your test controller (or local machine) specifies a database that contains the load test schema and that is currently available.  For more information, see the Visual Studio help topic 'About the Load Test Results Store'.   The connection error was: {0}