problems in pentaho demo apps -

I get a demo application from the net for the pentaho application ... it shows some error like home.jsp

  Could not generate chart image Sample / Steel Wheels / HomeDashboard / Sales_byte_title.Cart charts data could not be loaded from XDA Could not generate chart image. Chart data can not be loaded from samples / steel wheels / home dashboards / sales_b_productline.exe  

, any problem is what is the problem and how can I solve it < Sampling data should be loaded with the Demo application's in-memory database system: / p>

Generally, you will see this error because the Hysicic database is not running, or if you are trying to switch the demo server to another database engine, then something went wrong in that process.