Controller class WpLogin.php 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