Fatal error: Uncaught Error: Interface "ParagonIE\ConstantTime\EncoderInterface" not found in C:\WebServer\htdocs\bookshelf\vendor\paragonie\constant_time_encoding\src\Base64.php:53 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\paragonie\constant_time_encoding\src\Base64.php on line 53