当我将rails 4应用程序推送到heroku（git push -f heroku master）时，一切正常，除了以下错误消息。知道这些是什么以及我如何解决它们？感谢。
Your bundle is complete!
Gems in the groups development and test were not installed.
It was installed into ./vendor/bundle
Bundle completed (1.01s)
Cleaning up the bundler cache.
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/README.txt': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/Rakefile': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/History.txt': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/Manifest.txt': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/test/minitest/test_minitest_mock.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/test/minitest/metametameta.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/test/minitest/test_minitest_unit.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/test/minitest/test_minitest_spec.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/test/minitest/test_minitest_benchmark.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/hoe/minitest.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/spec.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/benchmark.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/hell.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/parallel_each.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/autorun.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/pride.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/unit.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/lib/minitest/mock.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/design_rationale.rb': Permission denied
cp: cannot create regular file `/app/tmp/cache/cedar/vendor/bundle/./ruby/2.0.0/gems/minitest-4.7.5/.autotest': Permission denied
-----> Writing config/database.yml to read from DATABASE_URL
Detected manifest file, assuming assets were compiled locally
-----> Discovering process types
Procfile declares types -> web
Default types for Ruby -> console, rake, worker
-----> Compressing... done, 33.5MB
-----> Launching... done, v76