ok, so after reading through everything I could find on this, I determined
the following:

   1. While I have all my gems specified by bundler, I had a .gems file,
   which until today wasn't causing any issues, but once I removed it, and
   ensured that heroku was loading my gem properly, it was all good.

This article got me on  the right track
http://devcenter.heroku.com/articles/gem-dependency

On Sun, Sep 4, 2011 at 6:05 PM, John McCaffrey <[email protected]>wrote:

> I redeployed an app today, and started getting a "You have already
> activated rack 1.3.2, but your Gemfile requires rack 1.2.3. Consider using
> bundle exec. (Gem::LoadError)"
>
> I have a rails 3.0.3 app, and according to my Gemfile
>  rails (= 3.0.3) depends on
>       rack (~> 1.2.1)
>
> I looked back at my Gemfile.lock, between these deployments, and rack has
> been set to 1.2.1 the whole time.
>
>  Did something change?  is there a way to execute a bundle exec command on
> the bamboo stack (I know you can on cedar, but I'm in the middle of pushing
> out a release and don't want to start messing with Cedar yet)
>
> --
> Thanks,
> -John
>
>


-- 
Thanks,
-John

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