Help me , help me. Quartus License problem.........

I am use the DE1 KIT. I have get license from Altera.com. But when i compile the program the error appear : ERROR :Current license file does not support the EP2C20F484C7 device.

How does i must to do to complile. Can you give me your solution to my email : dien207@gmail.com.

Thank you very much.