OpsWorks Rails App Server setup

I am trying to spin up an OpsWorks instance with the default Rails App Server setup and I am running into the following error:

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Error executing action `run` on resource 'ruby_block[ensure only our unicorn version is installed by deinstalling any other version]'
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Errno::ENOENT
-------------
No such file or directory - /usr/local/bin/gem


Cookbook Trace:
---------------
/var/lib/aws/opsworks/cache.stage2/cookbooks/dependencies/libraries/current_gem_version.rb:6:in ``'
/var/lib/aws/opsworks/cache.stage2/cookbooks/dependencies/libraries/current_gem_version.rb:6:in `ensure_only_gem_version'
/var/lib/aws/opsworks/cache.stage2/cookbooks/unicorn/recipes/default.rb:3:in `block (2 levels) in from_file'

The following image is the only configuration I've done. I have not added any additional recipes. (there are some custom security groups, but I don't think that would cause the above error. The instance I was trying to bring up was an m3.large with the Ubuntu 14.04 OS.