To generate reports on WSUS on management host you need to install Microsoft Report Viewer 2012 Redistributable:
https://www.microsoft.com/en-us/download/details.aspx?id=29065 > Install Instructions > Microsoft® System CLR Types for Microsoft® SQL Server® 2012
and
https://www.microsoft.com/en-ca/download/details.aspx?id=35747 > MICROSOFT® REPORT VIEWER 2012 RUNTIME