Symptoms

I have a problem with the out of the box Workspace reporting. When I click on Activity Statistics, Process Overview, Process Statistics or User Performance I get 404 http errors.
 

Diagnoses

As with most 404s this can happen for a variety of reasons. But, in this particular case the Microsoft Report Viewer component was not installed on the K2 Server.
We determined this by reviewing the fiddler trace and noticed the 404 was happening at the point where K2 tries to do a GET on the reporting object i.e:

GET http://tK2ServerName]/Workspace/Reserved.ReportViewerWebControl.axd?OpType=ResourceandVersion=9.0.21022.227andName=Microsoft.Reporting.WebForms.Scripts.ReportViewer.js HTTP/1.1
Accept: */*
Referer: http://tK2ServerName]/Workspace/OOBReports/ReportFilter.aspx?ReportID=1
HTTP/1.1 404 Not Found

 

Resolution

Check to make sure the Microsoft Report Viewer Redistributable 2008 SP1 component is installed on the K2 server as per the installation documentation below(see section for K2 Workspace): http://help.k2.com/onlinehelp/K2blackpearl/ICG/4.6.8/webframe.html_Prerequisites_Software.html
This component is required in order for the K2 reports to work properly.