PHP Core Warning – yii\base\ErrorException

$_GET = [
    'page' => '9',
];

$_COOKIE = [
    '_csrf' => '749dd85e4952b5d017deaabbcdf5e34c23db8ac5dd4dbd4d8d669d49018de005a:2:{i:0;s:5:"_csrf";i:1;s:32:"WxpIpI3E4Xb1tQ21sQzD06GMGseJbjG-";}',
    'PHPSESSID' => '54t60dp4sgiji8fhb0q7eit6d6',
];

$_SESSION = [
    '__flash' => [],
];