Error

PHP Noticeyii\base\ErrorException

Undefined index: mess

$_SERVER = [
    'PHPRC' => '/home/p178901',
    'PATH' => '/bin:/usr/bin:/usr/local/bin',
    'HTTP_ACCEPT' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
    'HTTP_ACCEPT_ENCODING' => 'x-gzip, gzip, deflate',
    'HTTP_HOST' => 'code4u.ru',
    'HTTP_USER_AGENT' => 'CCBot/2.0 (http://commoncrawl.org/faq/)',
    'DOCUMENT_ROOT' => '/home/p178901/www/code4u.ru',
    'REMOTE_ADDR' => '54.157.239.93',
    'REMOTE_PORT' => '34135',
    'SERVER_ADDR' => '46.254.21.69',
    'SERVER_NAME' => 'code4u.ru',
    'SERVER_ADMIN' => 'support@ihc.ru',
    'SERVER_PORT' => '80',
    'REQUEST_URI' => '/',
    'REDIRECT_URL' => '/',
    'REDIRECT_STATUS' => '200',
    'SCRIPT_FILENAME' => '/home/p178901/www/code4u.ru/web/index.php',
    'QUERY_STRING' => '',
    'SCRIPT_URI' => 'http://code4u.ru/',
    'SCRIPT_URL' => '/',
    'SCRIPT_NAME' => '/web/index.php',
    'SERVER_PROTOCOL' => 'HTTP/1.0',
    'SERVER_SOFTWARE' => 'LiteSpeed',
    'REQUEST_METHOD' => 'GET',
    'PHP_SELF' => '/web/index.php',
    'REQUEST_TIME_FLOAT' => 1490547489.482089,
    'REQUEST_TIME' => 1490547489,
    'argv' => [],
    'argc' => 0,
];