尝试运行Sinatra应用程序时，我不断收到此错误:/Users/matthewsmith/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/specification.rb:2064:in`raise_if_conflicts':Unabletoactivatesinatra-contrib-1.4.2,becausetilt-2.0.1conflictswithtilt(~>1.3)(Gem::LoadError)from/Users/matthewsmith/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rub