Deploy Symfony 4 - React js app on Heroku

Deploy Symfony 4 - React js app on Heroku
0

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?
Thanks