Why can’t the same result appear when we do the same thing? I watched the video several times.
I added debugging mode in the public environment, changed the value of app_debug to true in config.php, and looked for the problem step by step. It turned out that a comma full-width and half-width caused the program error.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
I added debugging mode in the public environment, changed the value of app_debug to true in config.php, and looked for the problem step by step. It turned out that a comma full-width and half-width caused the program error.