We got that error when we try to open a notebook without updating
previously Grafoscopio. Please use the update menus in the
Grafoscopio docking bar for th Grafoscopio and Dataviz packages.
That should solve the issue.
I would really have a better way of installing Grafoscopio. If you
have any suggestions on the Gopher, Metacello, installing front, or
even better, if you need any permissions on the source code
repository [1], just let me know.
[1] http://smalltalkhub.com/#!/~Offray/Grafoscopio
Cheers,
Offray