Heroku env json error

gistfile1.txt

 Error Message:

 JSON::ParserError: A JSON text must at least contain two octets!

 Where:

 [GEM_ROOT]/gems/json-1.4.6/lib/json/common.rb, line 146

 Backtrace Summary:

 [GEM_ROOT]/gems/json-1.4.6/lib/json/common.rb:146:in `initialize'

 [GEM_ROOT]/gems/json-1.4.6/lib/json/common.rb:146:in `new'

 [GEM_ROOT]/gems/json-1.4.6/lib/json/common.rb:146:in `parse'

 [GEM_ROOT]/gems/json-1.4.6/lib/json/common.rb:14:in `[]'

 [GEM_ROOT]/gems/nimble_nodes-0.9.0/lib/nimble_nodes/settings.rb:29:in `fetch_from_server'

 [GEM_ROOT]/gems/nimble_nodes-0.9.0/lib/nimble_nodes/settings.rb:20:in `cache'

 [GEM_ROOT]/gems/nimble_nodes-0.9.0/lib/nimble_nodes/settings.rb:9:in `[]'

 [GEM_ROOT]/gems/nimble_nodes-0.9.0/lib/nimble_nodes.rb:17:in `paused?'

 [GEM_ROOT]/gems/nimble_nodes-0.9.0/lib/nimble_nodes.rb:13:in `active?'

 [GEM_ROOT]/gems/nimble_nodes-0.9.0/lib/nimble_nodes/dynos.rb:51:in `monitor?'

 [GEM_ROOT]/gems/nimble_nodes-0.9.0/lib/nimble_nodes/middleware.rb:9:in `call'

 [GEM_ROOT]/gems/actionpack-2.3.5/lib/action_controller/string_coercion.rb:25:in `call'

 [GEM_ROOT]/gems/actionpack-2.3.5/lib/action_controller/params_parser.rb:15:in `call'

 [GEM_ROOT]/gems/actionpack-2.3.5/lib/action_controller/session/cookie_store.rb:93:in `call'

 [GEM_ROOT]/gems/actionpack-2.3.5/lib/action_controller/failsafe.rb:26:in `call'

 [GEM_ROOT]/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:106:in `call'

 /home/heroku_rack/lib/static_assets.rb:9:in `call'

 /home/heroku_rack/lib/last_access.rb:15:in `call'

 /home/heroku_rack/lib/date_header.rb:14:in `call'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/connection.rb:76:in `pre_process'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/connection.rb:74:in `catch'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/connection.rb:74:in `pre_process'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/connection.rb:57:in `process'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/connection.rb:42:in `receive_data'

 [GEM_ROOT]/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'

 [GEM_ROOT]/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/backends/base.rb:57:in `start'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/server.rb:156:in `start'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/controllers/controller.rb:80:in `start'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/runner.rb:177:in `send'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/runner.rb:177:in `run_command'

 [GEM_ROOT]/gems/thin-1.2.6/lib/thin/runner.rb:143:in `run!'

 [GEM_ROOT]/gems/thin-1.2.6/bin/thin:6

 /usr/ruby1.8.7/bin/thin:19:in `load'

 /usr/ruby1.8.7/bin/thin:19