For me, this error was a path issue while requirejs is looking for query. It has already been fixed in the halfpipe codebase. Updating my Gemfile to pull the latest half pipe code from github sorted it:
Gemfile
gem 'half-pipe', :github => "d-i/half-pipe"
Other than that, have you got the latest levels of npm, node, bower and grunt installed? I had to update each of these to get my install working.
I have: npm (1.4.7), grunt-cli v0.1.13, grunt v0.4.4, bower 1.3.2 and node v0.9.9 running on Ubuntu 13.10.