Acts_as_comparable: gem installation

Hi all,

I installed acts_as_comparable as gem and I added the
acts_as_comparable-method in my model.

But now I get this error:
NoMethodError: undefined method `acts_as_comparable’ for Ticket:Class

I tried to require the file, but Rails complained it could not find the
requested file. Can anyone help me with this? Never used gem’s in my

Thanks in advance!