Recently I have created a fb id , and verified my mobile number. I tried to protect my account by login approval option and login notification option via mobile . When I tried to do this ,a pop up widow will open , and it says

"Please check your browser settings

Your current Chrome settings might make it hard to use Login Approvals.

It's probably because:

You sometimes clear your cookies.

Your browser is set to automatically clear cookies whenever it closes.

You use your browser's "private browsing" or "incognito" mode.

You're using a new browser.

It may take a few days after fixing these issues before you will be able to enable Login Approvals. You also may need to log out and then log in again after fixing these settings for the changes to take effect.

Visit the Help Centre for step-by-step directions on how to fix these settings."

but ,none of this statements are true.My browser doesnt clear cookies automatically , even I wasnt browsing in icognito mood.

What can I do then?

I have tried by changing browser too. mozilla , IE , maxthon every browser give me the same output