Failed to run on Heroku

I deployed the Clojure app for Heroku. When I run / request it, I get an error message: http://glowing-planet-168.herokuapp.com/ . So now I want to run REPL to find out if I can get more information. But when I try, I get:

D:\Mijn documenten\My Dropbox\dev\clojure-projects\hebrewajax>heroku run lein repl

C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/heroku-2.2.4/lib/heroku/helpe
rs.rb:213:in ``': No such file or directory - tput cols (Errno::ENOENT)
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/heroku-2.2.4/lib
/heroku/helpers.rb:213:in `get_terminal_environment'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/heroku-2.2.4/lib
/heroku/command/run.rb:16:in `index'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/heroku-2.2.4/lib
/heroku/command.rb:114:in `send'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/heroku-2.2.4/lib
/heroku/command.rb:114:in `run'
        from C:/RailsInstaller/Ruby1.8.7/lib/ruby/gems/1.8/gems/heroku-2.2.4/bin
/heroku:14
        from C:/RailsInstaller/Ruby1.8.7/bin/heroku:19:in `load'
        from C:/RailsInstaller/Ruby1.8.7/bin/heroku:19

I get the same error when I start the "heroku run" console. I installed the hero using RailsInstaller.

I am running on Windows XP.

What could go wrong? Any gem I need, besides the heroes, yet?