Fatal error: Uncaught Error: Class "ParagonIE\Halite\KeyPair" not found in C:\Apache24\htdocs\cms_upgrade\vendor\paragonie\halite\src\SignatureKeyPair.php:37 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\paragonie\halite\src\SignatureKeyPair.php on line 37