How to install chart plugin in Redmine

cd {REDMINE_ROOT} [for me its /var/www/redmine]
$ ./script/plugin install git://github.com/pullmonkey/open_flash_chart.git

$ cd {RAILS_ROOT}
$ git clone https://github.com/cou2jpn/redmine_charts.git vendor/plugins/redmine_charts

Restart apache

Login as admin, go to the project settings >>  Module tab >> We need to enable Charts