Erreur codeigniter

j'utilise le framework CodeIgniter 3.1.2 avec xampp
au lancement j'ai cette erreur

Veuillez m'aidez svp

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A PHP Error was encountered

Severity: Error

Message: Uncaught TypeError: Argument 1 passed to CI_Exceptions::show_exception() must be an instance of Exception, instance of Error given, called in C:\xampp\htdocs\codeigniter\system\core\Common.php on line 658 and defined in C:\xampp\htdocs\codeigniter\system\core\Exceptions.php:190 Stack trace: #0 C:\xampp\htdocs\codeigniter\system\core\Common.php(658): CI_Exceptions->show_exception(Object(Error)) #1 [internal function]: _exception_handler(Object(Error)) #2 {main} thrown

Filename: core/Exceptions.php

Line Number: 190

Backtrace:

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