Controller class Web could not be found. 📋

Cake\Http\Exception\MissingControllerException
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    public function create(ServerRequestInterface $request): Controller
    {
        $className $this->getControllerClass($request);
        if ($className === null) {
            throw $this->missingController($request);
        }
        $reflection = new ReflectionClass($className);
        if ($reflection->isAbstract()) {

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