Error to deploy app on heroku

I try to deploy my MERN stack application backend on heroku but I got this error and I don’t know why can anybody help me?

Heroku log:

Heroku error:

The error log says there is likely more error logging above what you have shown - in the NPM output. That will tell you what actually caused the crash.

What does that say?

I found problem and now it’s working, thanks anyway :smiley: