Excel Services Application event 2026

When trying to run any BI sample report in Project Server 2010, the report gets stuck on loading the following event is logged

Log Name:      Application
Source:        Microsoft-SharePoint Products-Excel Services Application
Date:          9/18/2012 12:01:23 PM
Event ID:      2026
Task Category: Excel Calculation Services
Level:         Warning
Keywords:     
User:         
Computer:     
Description:
An internal error occurred.
   at Microsoft.Office.Excel.Server.MossHost.MossHost.Microsoft.Office.Excel.Server.Host.IEwaHost.IsSecureConnection()
   at Microsoft.Office.Excel.WebUI.EwaCUIDataSource.EnsureDocument()
   at Microsoft.Web.CommandUI.CUIDataSource.RunQuery(UIQuery query)
   at Microsoft.Office.Excel.WebUI.EwaRibbon.QueryRibbonDataSource(CultureInfo uiCulture, String clientID, Boolean denormalizeImareUri)
   at Microsoft.Office.Excel.WebUI.EwaStringsHandler.ProcessRequest(HttpContext context)
This error occured because there was no site collection created at the root of the web application, creating a blank site collection fixed the problem.

Also a hotfix is available http://support.microsoft.com/kb/2596582