Acts_as_ferret problem

Hi,

I want to use the act_as_ferret for search.
I have installed the ferret. (gem install ferret)
I have used the plugin acts_as_ferret.
But I got an error like no such file to load --ferret.

My rails version is 2.0.2. I am using mysql database.

Please help me in this issue.

Thank you,

srinivas rao.pala