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PHP Fatal Erroryii\base\ErrorException

Call to undefined function frontend\controllers\I()

$_COOKIE = [
    'PHPSESSID' => 'ubcnnl4llvbnamr1h1k7bmb8c2',
    '_csrf' => 'b0ddaefb51b399eabff2570795a56e9518a07db95fbdb4429b19312e34cfd1aba:2:{i:0;s:5:"_csrf";i:1;s:32:"oetY7KkVxd31fxwrVeMLa_Cwov3GPirN";}',
];

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