class UrlGenerationException extends Exception{    /**     * Create a new exception for missing route parameters.     *     * @param  \Illuminate\Routing\Route  $route     * @param  array  $parameters     * @return static     */    public static function forMissingParameters(Route $route, array $parameters = [])    {        $parameterLabel = Str::plural('parameter', count($parameters));         $message = sprintf(            'Missing required %s for [Route: %s] [URI: %s]',            $parameterLabel,            $route->getName(),            $route->uri()        );         if (count($parameters) > 0) {            $message .= sprintf(' [Missing %s: %s]', $parameterLabel, implode(', ', $parameters));        }         $message .= '.';         return new static($message);    }} 
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