How to fix the error in git push with heroku?

Good and I hope you are well, I have problems with using heroku, the problem occurs in the git push master, to make the push sends that error and I do not know what is due, and try to fix it but I can not. I hope you can help me (I use linux in case it is important the so I use). attached image of the error I get on my console

enter image description here