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Invalid Configurationyii\base\InvalidConfigException

The "ru" language does not exists in "cetver\LanguageSelector\items\DropDownLanguageItem::$languages"

$_GET = [
    'r' => 'site/index',
    'language' => 'ru',
];

Warning: file_put_contents(/var/www/html/pastopraxis_cimo_ipb_pt/runtime/debug/6606b699ae1a3.data): Failed to open stream: Permission denied in /var/www/html/pastopraxis_cimo_ipb_pt/vendor/yiisoft/yii2-debug/src/LogTarget.php on line 74