error: failed to push some refs to 'https://github.com/codernirmalnp/clientrepo.git' code example

Example 1: failed to push some refs to 'https://github.com/rng70/Web-Store.git'

$ git clone --mirror git://example.com/some-big-repo.git

Example 2: error: failed to push some refs to 'https://git.heroku.com/obscure-dawn-05608.git'

$ rake assets:precompile
$ git add .
$ git commit -m "Add precompiled assets for Heroku"
$ git push heroku master