Ruby on Rails migrate database and data from SQLite3 to Postgres

I'm trying to migrate a small SQLite database to Postgres so that I can put it on Heroku. It is proving to be extremely difficult. I'm not use to Ruby on Rails, so probably missing all the tricks.

I'm running Ruby 2.2.0 / Rails 4.2.0 on MAC

Any thoughs on what the issue is/

I'm running the following command to migrate from SQLite3 to Postgres. Note the Db:migrate worked and the database schema is in place. I just need to get the data into it now.

taps pull postgres://user@localhost/db/development http://user:secret@localhost:5000

I then get the following output:

Receiving schema Unable to fetch tables information from http://user:secret@localhost:5000. Please check the server log.

In another terminal where I started the service I get the following which contains an error referring to a table:

Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations::


$ **taps server sqlite://db/development.sqlite3 USER secret**
== Sinatra/1.0 has taken the stage on 5000 for production with backup from WEBrick
[2015-05-06 17:28:09] INFO  WEBrick 1.3.1
[2015-05-06 17:28:09] INFO  ruby 2.2.0 (2014-12-25) [x86_64-darwin14]
[2015-05-06 17:28:09] INFO  WEBrick::HTTPServer#start: pid=8274 port=5000
127.0.0.1 - USER [06/May/2015:17:28:57 +0100] "GET / HTTP/1.1" 200 - 0.0010
localhost - - [06/May/2015:17:28:57 BST] "GET / HTTP/1.1" 200 31
- -> /
127.0.0.1 - USER [06/May/2015:17:28:57 +0100] "POST /sessions HTTP/1.1" 200 - 0.0158
localhost - - [06/May/2015:17:28:57 BST] "POST /sessions HTTP/1.1" 200 46
- -> /sessions
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/utils/okjson.rb:427:in `valenc'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/utils/okjson.rb:438:in `block in arrenc'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/utils/okjson.rb:438:in `map'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/utils/okjson.rb:438:in `arrenc'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/utils/okjson.rb:410:in `encode'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/taps-0.3.24/lib/taps/server.rb:157:in `block in <class:Server>'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `call'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `block in route'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `block (2 levels) in route!'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `block in route!'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `block in call!'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `block in invoke'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/deflater.rb:35:in `call'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/auth/basic.rb:25:in `call'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/commonlogger.rb:33:in `call'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /Users/USER/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/handler/webrick.rb:89:in `service'
 /Users/USER/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
 /Users/USER/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
 /Users/USER/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
[2015-05-06 17:28:57] ERROR NoMethodError: undefined method `blank?' for {}:Hash
...........

localhost - - [06/May/2015:17:28:57 BST] "GET /sessions/1568289369/pull/table_names HTTP/1.1" 500 317 - -> /sessions/1568289369/pull/table_names