Hi Prem, if you added one Drools runtime in the Drools Eclipse Preferences and still getting the same error maybe you're missing to select the drools runtime as the default. There's a checkbox on the runtime lists, check this and you'll see that the error message "Select a default Drools Runtime" is gone (in the Preferences window) Then you need to restart eclipse, after that you will see the Drools Library inside the project. If the error still on the Problems view, you can delete this safetly. After this, all the new projects created should work fine. Regards, Lucas Amador El 13/05/2010, a las 16:56, Premkumar Stephen escribió: