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我試圖在Heroku上安裝WebSolr。我選擇了20美元/月的套餐。 我跟着插件頁面上的說明：WebSolr Heroku，默認安裝破解服務器啓動
添加以下到我的Gemfile：
gem 'sunspot_rails', '~> 1.3.0'
在Heroku的配置，我也有一個正確的URL：
WEBSOLR_URL: http://index.websolr.com/solr/xxxyyyzzz
當啓動服務器，我在本地和在heroku日誌中都得到相同的錯誤：
/Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/sunspot_rails-1.3.3/lib/sunspot/rails/configuration.rb:297:in `join': no implicit conversion of nil into String (TypeError)
from /Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/sunspot_rails-1.3.3/lib/sunspot/rails/configuration.rb:297:in `user_configuration'
from /Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/sunspot_rails-1.3.3/lib/sunspot/rails/configuration.rb:281:in `user_configuration_from_key'
from /Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/sunspot_rails-1.3.3/lib/sunspot/rails/configuration.rb:256:in `disabled?'
from /Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/sunspot_rails-1.3.3/lib/sunspot/rails.rb:30:in `build_session'
from /Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/sunspot_rails-1.3.3/lib/sunspot/rails/init.rb:1:in `<top (required)>'
from /Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `require'
from /Users/patricegagnon/.rvm/gems/ruby-2.1.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `block in require'
...
服務器拒絕啓動，我無法再訪問我的任何控制器。到目前爲止我還沒有做過任何其他事情。任何人都知道爲什麼這種通用的Solr集成打破了我的服務器啓動？