Redmine

Dear all,

i would like to run the redmine:email:imap task via cron but it's not working.
here are my configuration details
Environment:
Redmine version 2.3.1.stable
Ruby version 1.9.3 (i486-linux)
Rails version 3.2.13
Environment production
Database adapter Mysql2
Redmine plugins:
no plugin installed

when I run whereis rake, i have the following output
/usr/local/bin/rake

and this is my cron task that I set via my user - crontab -e

cd /var/www/redmine/ && /usr/local/bin/rake redmine:email:receive_imap RAILS_ENV="production" host=mail.***.ch username=support2@******* password=**** port=143 project=support allow_override=project unknown_user=accept --trace

I have also tried this one
cd /var/www/redmine/ && /usr/local/bin/rake -f redmine:email:receive_imap RAILS_ENV="production" host=mail.***.ch username=support2@******* password=**** port=143 project=support allow_override=project unknown_user=accept --trace

here is the email that sent the cron daemon

From: root@redmine (Cron Daemon)
To: redmine@redmine
Subject: Cron <redmine@REDMINE> cd /var/www/redmine/ && /usr/local/bin/rake redmine:email:receive_imap RAILS_ENV="production" host=mail.****.ch username=support2@***.org password=*** port=143 project=winmedia-support allow_override=project unknown_user=accept --trace
Content-Type: text/plain; charset=UTF-8
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/home/redmine>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=redmine>
Message-Id: <E1UpFI6-0005pj-9x@REDMINE>
Date: Wed, 19 Jun 2013 12:07:02 +0200

rake aborted!
cannot load such file -- /var/www/redmine/Rakefile
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/rake_module.rb:25:in `load'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/rake_module.rb:25:in `load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:589:in `raw_load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:89:in `block in load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:88:in `load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:72:in `block in run'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
/var/lib/gems/1.9.1/gems/rake-10.0.4/bin/rake:33:in `<top (required)>'
/usr/local/bin/rake:23:in `load'
/usr/local/bin/rake:23:in `<main>'

I am a bit confused and lost on this erros as it seems very simple when I read the documentation and I did'nt find the same issue on the forums or internet.

thanks in advance for your time and help, I really need to make that work.