Capifony - task "symfony:cache:warmup" fails in prod environment without error message

Question

I use capifony with symfony 2.

My deploy.rb

set :application, "Name project"
set :domain,      "My Ip"
set :deploy_to,   "My folder"
set :app_path,    "app"

set :repository,  "[email protected]:dou/test.git"
set :scm,         :git
# Or: `accurev`, `bzr`, `cvs`, `darcs`, `subversion`, `mercurial`, `perforce`, or `none`

set :model_manager, "doctrine"
# Or: `propel`

set :shared_files,      ["app/config/parameters.yml"]
set :shared_children,   [app_path + "/logs", web_path + "/uploads", web_path + "/media", "vendor"]

set :use_composer, true
#set :composer_options,  "--prefer-source --no-interaction"

set :deploy_via, :copy
set :branch, "master"

set :user, 'user'
set :password, 'pass'


role :web,        domain                         # Your HTTP server, Apache/etc
role :app,        domain, :primary => true       # This may be the same as your `Web` server

set  :keep_releases,  3
set :use_sudo,   false
set :update_vendors,    true 
# Be more verbose by uncommenting the following line
logger.level = Logger::MAX_LEVEL
#set :dump_assetic_assets, true
set :ssh_options, { :forward_agent => true }


default_run_options[:pty] = true

And it was all ok. But yesterday I had an error.

 * 2013-12-10 11:51:23 executing `symfony:cache:warmup'
--> Warming up cache
  * executing "sh -c 'cd /home/myproject/beta/releases/20131210094811 && php app/console cache:warmup --env=prod --no-debug'"
    servers: ["IP"]
    [IP] executing command
 ** [out :: IP] Warming up the cache for the prod environment with debug false
    command finished in 18712ms
*** [deploy:update_code] rolling back
  * executing "rm -rf /home/myproject/beta/releases/20131210094811; true"
    servers: ["IP"]
    [IP] executing command
    command finished in 633ms
failed: "sh -c 'sh -c '\\''cd /home/myproject/beta/releases/20131210094811 && php app/console cache:warmup --env=prod --no-debug'\\'''" on IP

Capifony try clear cache for prod, but it can't.So Can I see somehow error, why it can't clear cache? It clear cache for dev, but for prod it fails without any error for me.