Notice (1024) : Undefined property: ErrorController::$UserAuth in /home3/codehev9/public_html/sites/ump4/src/Controller/AppController.php on line 87 [in /home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Controller/Controller.php, line 329]
Notice (1024) : Undefined property: ErrorController::$UserAuth in /home3/codehev9/public_html/sites/ump4/src/Controller/AppController.php on line 204 [in /home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Controller/Controller.php, line 329]
Warning (512) : Unable to emit headers. Headers sent in file=/home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php line=36 [in /home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 71]
Warning (2) : Cannot modify header information - headers already sent by (output started at /home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:36) [in /home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 164]
Warning (2) : Cannot modify header information - headers already sent by (output started at /home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:36) [in /home3/codehev9/public_html/sites/ump4/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 197]
Error: Controller class Sitemap.xml could not be found.

Controller class Sitemap.xml could not be found. 📋

Cake\Http\Exception\MissingControllerException
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     * @return \Cake\Http\Exception\MissingControllerException
     */
    protected function missingController(ServerRequest $request)
    {
        return new MissingControllerException([
            'class' => $request->getParam('controller'),
            'plugin' => $request->getParam('plugin'),
            'prefix' => $request->getParam('prefix'),
            '_ext' => $request->getParam('_ext'),

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