Redmine

Hi,

I have a problem when I put any plugin on my redmine/plugins my redmine server crash.
For example I had try to install better gantt chart :

cd redmine/plugins
git clone https://github.com/kulesa/redmine_better_gantt_chart.git

I retart my apache and when i try to go on my server I see this message one one page named Ruby (Rack) application could not be started.

/var/lib/gems/1.8/gems/bundler-1.2.1/lib/bundler/dsl.rb:82:in `gem': You cannot specify the same gem twice with different version requirements. You specified: test-unit (>= 0) and test-unit (= 1.2.3) (Bundler::DslError)

When I do the next action it bloc too :

rake redmine:plugins:migrate RAILS_ENV=production
(in /usr/local/share/redmine)
/var/lib/gems/1.8/gems/bundler-1.2.1/lib/bundler/dsl.rb:82:in `gem': You cannot specify the same gem twice with different version requirements. You specified: test-unit (>= 0) and test-unit (= 1.2.3)

Anybody know why?