laravel错误不允许序列化“关闭”

Question

我在返回语句的控制器中遇到以下错误

  

不允许对“关闭”进行序列化

检查了与Google搜索不同的想法，但仍无法解决。

public static function user_apply_job($jobid)
{
    if (Auth::check()) {
        $authid = Auth::id();
        //Check valid total credits
        $total_credits = 0;   //Initializing variable
        $total_credits = PostsController::get_allcredits();

        $message = "Total Credits are" . $total_credits;
        echo "<script type='text/javascript'>alert('$message');</script>";

        if (($total_credits - 4) < 0) {
            return view('users.buycredits_prof');
        }
        .....
    }
}

无法修复此序列化错误。请帮忙解决此问题。