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This error is because of facebook has updated permissions that you are looking for to new ones refer latest permissions this documentation shows latest permissions and update yours https://developers.facebook.com/docs/facebook-login/permissions
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just remove manage_pages from the scope and it will work
<fb:login-button size="large"
scope="public_profile,email,pages_show_list,read_insights,manage_pages"
onlogin="checkLoginState();"> Click here to sync </fb:login-button>
to
<fb:login-button size="large"
scope="public_profile,email,pages_show_list,read_insights"
onlogin="checkLoginState();"> Click here to sync </fb:login-button>