PHP Core Warning – yii\base\ErrorException

$_SERVER = [
    'HTTP_HOST' => 'orangy.ru',
    'HTTP_X_FORWARDED_FOR' => '34.237.138.69, 34.237.138.69',
    'HTTP_X_FORWARDED_PROTO' => 'http',
    'HTTP_X_REQUEST_SCHEME' => 'http',
    'HTTP_CONNECTION' => 'close',
    'HTTP_USER_AGENT' => 'CCBot/2.0 (https://commoncrawl.org/faq/)',
    'HTTP_ACCEPT' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
    'HTTP_ACCEPT_LANGUAGE' => 'en-US,en;q=0.5',
    'HTTP_IF_MODIFIED_SINCE' => 'Thu, 29 Oct 2020 16:05:12 GMT',
    'HTTP_ACCEPT_ENCODING' => 'br,gzip',
    'PATH' => '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin',
    'SERVER_SIGNATURE' => '
Apache/2.4.41 (Ubuntu) PHP/5.6.40 Server at orangy.ru Port 80
',
    'SERVER_SOFTWARE' => 'Apache/2.4.41 (Ubuntu) PHP/5.6.40',
    'SERVER_NAME' => 'orangy.ru',
    'SERVER_ADDR' => '10.3.226.103',
    'SERVER_PORT' => '80',
    'REMOTE_ADDR' => '34.237.138.69',
    'DOCUMENT_ROOT' => '/home/orange-1/orange-1.nichost.ru/docs',
    'REQUEST_SCHEME' => 'http',
    'CONTEXT_PREFIX' => '',
    'CONTEXT_DOCUMENT_ROOT' => '/home/orange-1/orange-1.nichost.ru/docs',
    'SERVER_ADMIN' => 'postmaster@orange-1.nichost.ru',
    'SCRIPT_FILENAME' => '/home/orange-1/orange-1.nichost.ru/docs/index.php',
    'REMOTE_PORT' => '46010',
    'GATEWAY_INTERFACE' => 'CGI/1.1',
    'SERVER_PROTOCOL' => 'HTTP/1.0',
    'REQUEST_METHOD' => 'GET',
    'QUERY_STRING' => '',
    'REQUEST_URI' => '/',
    'SCRIPT_NAME' => '/index.php',
    'PHP_SELF' => '/index.php',
    'REQUEST_TIME_FLOAT' => 1606505793.678,
    'REQUEST_TIME' => 1606505793,
    'argv' => [],
    'argc' => 0,
];