Fedena installation: Error

am getting error:

rake db:migrate (in /home/hsrai/public_html/ERP/ERP_Campus/projectfedena_v2.0) rake aborted! can't activate , already activated prawn-0.11.1

Where is problem?

Fedena is Ruby on Rails (RoR) application.

My installation log is below signature.

mkdir ERP cd ERP wget http://202.164.53.122/ERP/ERP_Campus.tar.gz tar -zxvf ERP_Campus.tar.gz cd ERP_Campus/projectfedena_v2.0/ sudo apt-get install rake ruby1.8-dev rake gems:install sudo gem install rails -v=2.3.5 --remote sudo rake gems:install sudo gems install prawn joe config/database.yml sudo gem install mysql --remote rake db:create rake db:migrate ruby script/server