Issue launching app on Heroku: requires different GEMS?

I'm trying to push an app to Heroku ... and everything goes well, except that I see an error page when I try to actually view it on Heroku.

On my machine, it works fine though. I followed the basic steps to get a Hello World example going on Heroku and that worked fine on my machine as well as on Heroku ... but my app seems to be having some weird开发者_如何学Python issues.

The push works fine, everything seems to setup correctly, but this is what the logs say:

2011-07-09T03:32:01+00:00 app[web.1]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:27:in `block in setup': You have already activated daemons 1.1.0, but your Gemfile requires daemons 1.0.10. Consider using bundle exec. (Gem::LoadError)

...

2011-07-09T03:32:35+00:00 heroku[router]: Error H10 (App crashed) -> GET high-sunrise-670.heroku.com/ dyno= queue= wait= service= status=503 bytes= 2011-07-09T03:32:36+00:00 heroku[router]: Error H10 (App crashed) -> GET high-sunrise-670.heroku.com/favicon.ico dyno= queue= wait= service= status=503 bytes= 2011-07-09T03:32:36+00:00 heroku[router]: Error H10 (App crashed) -> GET high-sunrise-670.heroku.com/favicon.ico dyno= queue= wait= service= status=503 bytes= 2011-07-09T03:40:25+00:00 heroku[router]: Error H10 (App crashed) -> GET high-sunrise-670.heroku.com/ dyno= queue= wait= service= status=503 bytes=

I'm very new to this stuff, so I'm sorry if this is a silly question. I don't get why it requires an older daemons version. I checked my Gemfile and nothing required that specifically. I then checked my Gemfile.lock and it says GEM requires it. No idea what that means though (or why Heroku has issues with it ...). Can I change that somehow?

Thanks a lot!

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As a first step I'd try to delete Gemfile.lock, run bundle install, then try deploying again.

When you run your application locally, make sure you use bundle exec. This way Gem errors should pop up.