This warning tells you that the SPI will not run with the desired frequency. You want 8MHz, and get 7.825MHz.
Is there a reason your main oscillator runs with 62.6MHz? Thats a quite strange frequency, and there is no clock divider that will get you 8Mhz out of it.
Thank you hli for your reply.
I was just set as it was. There is no such reason.
How can I set it?
In that screen, double-click on the clock and it will open the clock settings.
When ever i click on the clock it takes me to the SPI settings window.
I also select the clock to set it internally for SPI. Because of this i am unable to change it.?
Go to the "Edit Clock" option as shown in the image attached by you.