deploy via capistrano fail - ruby-on-rails

Question

2013-06-17 15:23:22 executing `deploy'
* 2013-06-17 15:23:22 executing `deploy:update'
** transaction: start
* 2013-06-17 15:23:22 executing `deploy:update_code'
updating the cached checkout on all servers
executing locally: "hg log --verbose -r tip --template \"{node|short}\""
command finished in 74ms
* executing "if [ -d /home/user/shared/cached-copy ]; then hg pull --verbose --repository /home/user/shared/cached-copy ssh://hg#bitbucket.org/user/myapp && hg update --verbose --repository /home/user/shared/cached-copy --clean 70d2fc5e4a40; else hg clone --verbose --noupdate ssh://hg#bitbucket.org/user/myapp /home/user/shared/cached-copy && hg update --verbose --repository /home/user/shared/cached-copy --clean 70d2fc5e4a40; fi"
[192.168.1.204] executing command
** [192.168.1.204 :: out] running ssh hg#bitbucket.org 'hg -R user/myapp serve --stdio'
** [192.168.1.204 :: out] pulling from ssh://hg#bitbucket.org/user/myapp ** [192.168.1.204 :: out] searching for changes
** no changes found
** [192.168.1.204 :: out] remote: Warning: Permanently added the RSA host key for IP address '207.223.240.182' to the list of known hosts.
** [192.168.1.204 :: out] abort: unknown revision '70d2fc5e4a40'!
i made a deploy.rb script to deploy a rails application via capistrano the problem is that when i run cap deploy there is something wrong with the cloning process and id on't know what this revision is. this is my deploy.rb :
require "rvm/capistrano"
require "bundler/capistrano"
set :application, "myapp"
set :use_sudo , false
default_run_options[:pty] = true
ssh_options[:forward_agent] = true
set :rvm_type, :user
set :rvm_install_with_sudo, true
set :rvm_ruby_string, ENV['GEM_HOME'].gsub(/.*\//,"")
set :scm, :mercurial
set :repository, "ssh://hg#bitbucket.org/user/myapp"
set :deploy_to, "/home/user/"
set :user, "user"
set :scm_verbose, true
set :deploy_via, :remote_cache
ssh_options[:forward_agent] = true
can anyone help me?
PS : i forget to tell that my repository has two sub repositories would that be the problem or do i need to set any options for that?