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

Thank you @DavidKarlsson, just adding to your answer, there is no need to uninstall the existing rack. Following the recommendation of @hak8or in https://github.com/ricardochimal/taps/issues/128 I used a Gemfile to ensure usage of rack version 1.0.1. But after I installed I had various versions of rack

$ gem uninstall 'rack'

Select gem to uninstall:
1. rack-1.0.1
2. rack-1.4.4
3. rack-1.4.5
4. rack-1.5.2
5. All versions

and did not want to uninstall them, because that could affect other projects I have in the same machine. When I run taps it would use the latest, rack-1.5.2, so what I did was to run taps using bundle exec, in my case

bundle exec taps server sqlite://db/development.sqlite3 root root

Hope it helps!