Hi Laurent, I tried to load roassal into Pharo 1.1 using the Gofer application in the pharocast and I receive the error: ROTreeMapLayout layouting layoutNode:rectangle:level: Is not the first time I have this experience i.e. to load a package and receive an error. May I ask if there is any tutorial or documentation that can explain to me which version I must have for loading a package? By the way: which is the process for updating an old version without loosing all modification. Thank you very much. Lorenzo _____ Da: pharo-project-bounces@lists.gforge.inria.fr [mailto:pharo-project-bounces@lists.gforge.inria.fr] Per conto di laurent laffont Inviato: mercoledì 19 settembre 2012 21.14 A: A friendly place where any question about pharo is welcome; An open mailing list to discuss any topics related to an open-sourceSmalltalk Oggetto: [Pharo-project] [Screencast] Roassal, an agile visualization engine Roassal graphically renders objects using short and expressive Smalltalk expressions. A large set of interaction are offered for a better user experience. Painting, brushing, interconnecting, zooming, drag and dropping will just make you more intimate with any arbitrary object model. Thank you Vanessa Peña ! http://www.pharocasts.com/2012/09/roassal.html Laurent