A developer encountered a problem with an incompatibility between the…

… Ruby JSON lib and ActiveSupport 2.3.2 when a Tropo::Generator.say 'foo bar' was called. The error was: 'TypeError Exception: wrong argument type Hash (expected Data)'. An upgrade to 2.3.5 of ActiveSupport resolved the issue.
tropo · Feb 11, 2010 · 7e1591a · 7e1591a
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@@ -12,6 +12,8 @@ your own web servers.
 * Ruby v1.8.6+ or JRuby v1.4.0+
 * RubyGems
 
+Note: If using with ActiveSupport, v2.3.5 or better of ActiveSupport is required.
+
 == Installation
 
   $ sudo gem install tropo-webapi-ruby