Rubyforge gem problem

Problem:

starting the server and you get:

 can't activate rubyforge (= 0.4.5), already activated rubyforge-1.0.0] (Gem::Exception)

Solution:
remove old versions of rubyforge gem

jorrel@helen ~ $ sudo gem uninstall rubyforge

Select gem to uninstall:
1. rubyforge-0.4.4
2. rubyforge-0.4.5
3. rubyforge-1.0.0
4. All versions
> 1
Successfully uninstalled rubyforge-0.4.4
jorrel@helen ~ $ sudo gem uninstall rubyforge

Select gem to uninstall:
1. rubyforge-0.4.5
2. rubyforge-1.0.0
3. All versions
> 1
Successfully uninstalled rubyforge-0.4.5
jorrel@helen ~ $ gem list | grep rubyforge
rubyforge (1.0.0)