'After Install and set the heroku cli I am not able to run the application

enter image description here

Could you please help me on the same.

I was try with the following commands

"git push heroku main" (But this command is not working its shows failed to push some refs....)

Then after I was try with " git push heroku master" and its work all push the data.

But when i click the link its shows Application error as mention below. enter image description here

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