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PHP Core Warningyii\base\ErrorException

Module 'json' already loaded

$_GET = [
    'authclient' => 'facebook',
];

$_SESSION = [
    '__flash' => [],
    'yii\\authclient\\clients\\Facebook_facebook_authState' => '8dd54a41f206baaced6f225f0362a55e53228d490dc382ce8446f0cb3245ddc0',
];