[Chameleon] Problem using chameleon demo.

[BAUD remi]

Hi,
I've got a problem when I open http://localhost/ms4w/apps/chameleon_sample/htdocs/index.phtml.
The fellowing error appear:
 
Fatal error: Class sampleapp: Cannot inherit from undefined class chameleon in D:\apps\chameleon_sample\htdocs\index.phtml on line 14

What should i do?
Best regard!