taps migration failing from sqlite to postgres rails4, ruby 1.9.3

Question

I am trying to migrate my Rails app to Postgresql for heroku however i can\'t get taps to get the data from my SQLite3 database, here is what i have tried:

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Answer 1

@David Karlsson's answer worked for me too. Except I had to update back rack once taps has completed the pull

gem update rack

and run bundle install to get back all my gems working.

I'm on rails 3.2 and ruby 1.9.3