Use coffeescript 1.6.2, or perhaps a version later than 1.6.3. Version 1.6.3 has a bug in it that produces the error:
ERROR Unable to load /.../scripts/offmsgs: TypeError: Cannot call method 'error' of undefined
Use coffeescript 1.6.2, or perhaps a version later than 1.6.3. Version 1.6.3 has a bug in it that produces the error:
ERROR Unable to load /.../scripts/offmsgs: TypeError: Cannot call method 'error' of undefined