deployment error

running capistrano 2.1 and trying to deploy on my server, I got the
following error

/usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/capistrano/
recipes/deploy/scm/subversion.rb:58:in `query_revision': tried to run
`svn info /var/svn/aelmat/redmine/  -rHEAD' and got unexpected result
"" (RuntimeError)
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/recipes/deploy/scm/base.rb:35:in `send'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/recipes/deploy/scm/base.rb:35:in `method_missing'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/recipes/deploy/scm/base.rb:63:in `local'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/recipes/deploy/scm/base.rb:35:in `method_missing'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/recipes/deploy.rb:37:in `load'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/configuration/variables.rb:87:in `call'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/configuration/variables.rb:87:in `fetch'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/configuration/variables.rb:110:in `protect'
         ... 35 levels...
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/lib/
capistrano/cli/execute.rb:14:in `execute'
        from /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.1.0/bin/
cap:4
        from /usr/local/bin/cap:16:in `load'
        from /usr/local/bin/cap:16

whare shoudl I start looking ?

thanks