jqgrid rails3.1rc4

hi everyone,
I'm trying to use jqgrid on rails 3.1 rc
but in keep getting this error : b.jgrid.formatter is undefined

after googling and a little firebug, it seems like grid.locale-fr.js
is not loaded in application.js

I wrote this in application.js

//= require "grid.locale-fr"
//= require "jqGrid"

I also have another problem now when I run rake assets:precompile in
the terminal
i get:
rake aborted!
undefined method `process_ClosureCompiler==_directive' for
#<Sprockets::DirectiveProcessor:0xa4a6c58>

please if you have any idea feel free to share your knowledge