title: SQL Server 2017 Maintenance Plan Wizard -- Scheduler does not Work
body: <p>I am running SQL Server 2017 with SQL Server Management Studio 17.6 under Windows Server 2016.</p>
  
  <p>I want to make a BACKUP plan for my database and I am using the Management Plan Wizard. On the second screen of the Wizard, there is a button which enables you to CHANGE the Maintenance Plan SCHEDULE. When I press the CHANGE button, I get an error message saying :</p>
  
  <blockquote>
    <p>Object reference not set to an instance of an object. (SqlMgmt)</p>
  </blockquote>
  
  <p>I would greatly appreciate any assistance to resolve this. Thank you !</p>