Wizard SDT Property Cannot Be Empty

The 'SDT' property cannot be empty. Define an SDT for the wizard and assign it in this property.

Each wizard, needs to have a Wizard SDT. A Wizard SDT is an SDT that contains data which is shared between steps and that will be used when the wizard is completed.
For more information about this read Defining a Wizard SDT. Set the Wizard SDT in the “SDT” property of the “Wizard” node.

Setting the Wizard SDT in the SDT property of the Wizard node.