Cscope find the result of the function that is used in source directory but can't show up vi editor screen

For example, put cscope commands like below.

cs find s start_kernel

then, cscope found 4 places where start_kernel have been used.

But there is no selection part, that means I can't choose the number 1 to 4 where

I want to see the page.

Furthermore, the VI editor doesn't show anything...

what should i do for this problem...