yii\base\ErrorException
Error

PHP Fatal Erroryii\base\ErrorException

Class 'yii\base\UnknownClassException' not found

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

Fatal error: Uncaught exception 'yii\base\ErrorException' with message 'Unknown: open(/var/cpanel/php/sessions/ea-php56/sess_i69hrant0suglt0bj8iioe3lg2, O_RDWR) failed: Input/output error (5)' in Unknown:0 Stack trace: #0 [internal function]: yii\base\ErrorHandler->handleError(2, 'Unknown: open(/...', 'Unknown', 0, Array) #1 {main} thrown in Unknown on line 0