newbie-question on ruby gems in netbeans

[nerdcraft]

Dear all,

I've installed a gem via the the manager. But if i try to use this gem:

require 'simple_progressbar'

I get the message:

/home/tuttle/NetBeansProjects/RubyApplication1/lib/main.rb:1:in `require': no such file to load -- simple_progressbar (LoadError)

If I copy simple_progressbar.rb directly into the projects lib directory it works (of course). Any idea what's going on?

Thank you in advance!

Eric