AD9959 evaluation board is not found by the "AD9958_59 Evaluation Software"

When I open the "AD9958_59 Evaluation Software", there is always red writing in the status box,and the error is:Evaluation Board Not Found!!!

I followed the instructions exactly, and when I use "USB Eval Board Programmer" to program EEPROM, there is a pop-up says "You must cycle power to the evaluation bpard for the new board identity to take effect". Is cycling power the key to solving this problem? what do I need to do?