Deprecated (8192) : Creation of dynamic property App\Controller\ErrorController::$app_folder is deprecated [in /home/poll2know/web/poll2know.com/public_html/src/Controller/AppController.php, line 32]
Deprecated (8192) : Creation of dynamic property App\Controller\ErrorController::$mailer is deprecated [in /home/poll2know/web/poll2know.com/public_html/src/Controller/AppController.php, line 33]
Deprecated (8192) : Creation of dynamic property App\Controller\ErrorController::$protocol is deprecated [in /home/poll2know/web/poll2know.com/public_html/src/Controller/AppController.php, line 36]
Deprecated (8192) : Creation of dynamic property App\Controller\ErrorController::$path is deprecated [in /home/poll2know/web/poll2know.com/public_html/src/Controller/AppController.php, line 37]
Deprecated (8192) : Creation of dynamic property App\Controller\ErrorController::$isLocal is deprecated [in /home/poll2know/web/poll2know.com/public_html/src/Controller/AppController.php, line 38]
Deprecated (8192) : Creation of dynamic property App\Controller\ErrorController::$currlang is deprecated [in /home/poll2know/web/poll2know.com/public_html/src/Controller/AppController.php, line 114]
Warning (512) : Unable to emit headers. Headers sent in file=/home/poll2know/web/poll2know.com/public_html/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php line=37 [in /home/poll2know/web/poll2know.com/public_html/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 65]
Warning (2) : Cannot modify header information - headers already sent by (output started at /home/poll2know/web/poll2know.com/public_html/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /home/poll2know/web/poll2know.com/public_html/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 159]
Warning (2) : Cannot modify header information - headers already sent by (output started at /home/poll2know/web/poll2know.com/public_html/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /home/poll2know/web/poll2know.com/public_html/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 192]
Error: Cake\Utility\Security::setSalt(): Argument #1 ($salt) must be of type string, null given, called in /home/poll2know/web/poll2know.com/public_html/config/bootstrap.php on line 189

Cake\Utility\Security::setSalt(): Argument #1 ($salt) must be of type string, null given, called in /home/poll2know/web/poll2know.com/public_html/config/bootstrap.php on line 189 📋

TypeError
Error in: CORE/src/Utility/Security.php, line 304
CORE/src/Utility/Security.php at line 304 (edit)
     *
     * @param string $salt The salt to use for encryption routines.
     * @return void
     */
    public static function setSalt(string $salt): void
    {
        static::$_salt = $salt;
    }
}

If you want to customize this error message, create templates/Error/error500.php