quartus 10 wont generate sof file

Hi everybody,

I have a serious problem concerning generating sof file using Quartus 10. I am using a DE2 BOARD(CYCLONE EP2C35 ) and when I compile my project everything is fine, but it wont generate the sof file so I can program my DE2 BAORD. by the way I download the quartus 10 from ALTERA website.

any help will be very appreciated.

David,