Redmine

Hi guys,
i have a problem with the installation of redmine. I think I'd done everything as it is
written in the description.

Now the problem: I got an error-message after the following instruction:
rake generate_session_store

rake aborted!
ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (ava
ilable in RDoc 2.4.2+) instead.
C:/webserver/Redmine/Rakefile:8
(See full trace by running task with --trace)

Here my installed versions:

1) rubyinstaller-1.8-7-302.exe
2) rake 10.1.0
3) rails 3.2.5
4) i18n 0.4.2
5) mongrel_service-0-3-4i386-mswin32.gem
6) win32-service-0.5.2-mswin32.gem
7) mysql-2.9.1-x86-mingw32

It would be nice if so can help me

kind regards
M.Dessel