Redmine: Retrieve emails from email server, rake not found

I am trying to setup Redmine to pull emails from my email server. When I look at the logs, I see the error "/bin/sh: 1: rake: not found".

I am running:

* * * * * cd /home/user/redmine-2.2.0-0/apps/redmine && rake -f /home/user/redmine-2.2.0-0/apps/redmine/htdocs/Rakefile redmine:email:receive_pop3 RAILS_ENV="production" host=<ip_address> username=<user@domain> password=<password>.