Error deploying in Heroku

I followed the flow-kitty instructions on their GitHub page and from there i got the private key, account address, kibble, kibble-items, kibble-market place address. In short all the things that are required to deploy the app on Heroku.
so after filling all the fields in Heroku when i click on “deploy” it shows

"Create app
App creation failed. Please ensure you have valid values in the above form fields.

Configure environment
There was an issue setting up your app environment.

an unexpected error caused the job to fail"

I tried more that once and each time this shows up on the screen. so any suggestions?