Error when running heroku run rake db:migrate

Error when running heroku run rake db:migrate

References

Reference NO 1

http://stackoverflow.com/questions/15187755/error-when-running-heroku-run-rake-dbmigrate

Reference NO 2

http://stackoverflow.com/questions/13009060/heroku-run-rake-dbmigrate-role-error

Reference NO 3

https://github.com/heroku/heroku/issues/746

Reference NO 4

https://github.com/heroku/heroku/issues/456

Reference NO 5

http://help.airbrake.io/discussions/problems/4190-heroku-gives-me-an-error-running-rake-dbmigrate

Reference NO 6

https://devcenter.heroku.com/articles/ruby

Reference NO 7

https://teamtreehouse.com/forum/deploying-to-heroku-error

Reference NO 8

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