A Scheduled Report can not be created.The selection of a Report Parameter is required but the drop down has no values.
A Saved Report must be created (Report Parameters > Save Settings) before Scheduled Report creation is possible. Run the required report and save the parameters.Afterwards it will appear in the Reports Parameters drop down when creating the Schedule Report.
http://communities.bentley.com/products/licensing/w/licensing__wiki/19502.how-to-schedule-a-report