Error loading custom subclass

[eluser]ralf57[/eluser]
[quote author="tonanbarbarian" date="1198259300"]I believe the Language class is automatically loaded and this is why you are getting the error.....[/quote]

you're right,
the language class is automatically loaded but there is no mention of this in the User Guide, at least here http://ellislab.com/codeigniter/user-gui...guage.html
anyway,thanks for the trick