cannot load such file -- config/boot (LoadError)

Hi folks,

I had installed an ubuntu server redmine 12:04

I decided to upgrade to the new version redmine.
After following all the steps in this tutorial:
http://www.keopx.net/blog/howto-install-redmine-242-ubuntu-1204-lts
I am getting the below error message.
How to proceed?

/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot
load such file -- /var/www/redmine/../config/boot (LoadError)
   from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
   from /var/www/redmine/dispatch.fcgi:3:in `<main>'
[Thu Aug 14 15:28:21 2014] [warn] [client 10.0.0.120] (104)Connection
reset by peer: mod_fcgid: error reading data from FastCGI server,
referer: http://10.0.0.220/redmine/admin/projects
[Thu Aug 14 15:28:21 2014] [error] [client 10.0.0.120] Premature end of
script headers: dispatch.fcgi, referer:
http://10.0.0.220/redmine/admin/projects

From the path shown in the error, I’m wondering if you didn’t append ‘/public’ to the DocumentRoot in the apache configuration?