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我在我的rails應用上使用了gem rapns（https://github.com/ileitch/rapns）。在heroku上使用rapns進行推送通知
據rapns醫生，我需要運行
bundle exec rapns
來啓動守護進程，檢查數據庫中新通知來發送。
所以我也以下：
heroku run bundle exec rapns production --foreground
這給了我錯誤：
Running bundle exec rapns production --foreground attached to terminal... up, run.3
[WARNING] Detected Rails 3.1.1, patching PostgreSQLAdapter to fix reconnection bug: https://github.com/rails/rails/issues/3160
/app/.bundle/gems/ruby/1.9.1/gems/rapns-1.0.1/lib/rapns/daemon.rb:95:in initialize': No such file or directory - /app/tmp/pids/rapns.pid (Errno::ENOENT)
from /app/.bundle/gems/ruby/1.9.1/gems/rapns-1.0.1/lib/rapns/daemon.rb:95:inopen'
from /app/.bundle/gems/ruby/1.9.1/gems/rapns-1.0.1/lib/rapns/daemon.rb:95:in write_pid_file'
from /app/.bundle/gems/ruby/1.9.1/gems/rapns-1.0.1/lib/rapns/daemon.rb:43:instart'
from /app/.bundle/gems/ruby/1.9.1/gems/rapns-1.0.1/bin/rapns:28:in <top (required)>'
from /app/.bundle/gems/ruby/1.9.1/bin/rapns:19:inload'
from /app/.bundle/gems/ruby/1.9.1/bin/rapns:19:in `'
我非常非常新的軌道和紅寶石，誰能告訴我這是怎麼回事了？