Deploy Symfony 4 - React js app on Heroku

Hello ,
Is there anyone deploy Symfony 4 application on Heroku?
My application is developing with Symfony 4 in the backend and React js in the frontend, then I want to deploy it on Heroku. I have already connected heroku with my github repository. Finally after I configured everything, I launched the command git push heroku master , then I found the following error shown on the image below:

Can anyone give me any solution or suggestion?

Hi @amare16 , This problem is possibly due to @auto-scripts being enabled in post-install-cmd in composer.json . You need to remove it, and it may work fine. i.e. Your composer.json will look as:

"post-install-cmd": [

        "post-update-cmd": [