Invalid "access arguments" in hook_menu()

function cache_graceful_menu() {
  $items = array();
  $items['admin/config/system/cache_graceful'] = array(
    ...
    'access arguments' => array('administer site'),
  );
  return $items;
}

There is no hook_perm() that defines "administer site". Did you mean "administer site configuration"?