Warning: shell_exec() [function.shell-exec]: Unable to execute 'stat -f -c "%T" /proc 2>/dev/null'

[RFFox]

new installation causes warning: Anything I can do to get it fixed?

Warning: shell_exec() [function.shell-exec]: Unable to execute 'stat -f -c "%T" /proc 2>/dev/null' in /home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti/Process.php on line 216

Backtrace -->
#0 Piwik\Error::errorHandler(...) called at [:]
#1 shell_exec(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti/Process.php:216]
#2 Piwik\CliMulti\Process::isProcFSMounted(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti/Process.php:157]
#3 Piwik\CliMulti\Process::isSupported(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti.php:163]
#4 Piwik\CliMulti->supportsAsync(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti.php:46]
#5 Piwik\CliMulti->__construct(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/SystemCheck.php:187]
#6 Piwik\Plugins\Installation\SystemCheck::getSystemInformation(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Controller.php:406]
#7 Piwik\Plugins\Installation\Controller::getSystemInformation(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Controller.php:604]
#8 Piwik\Plugins\Installation\Controller->setupSystemCheckView(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Controller.php:119]
#9 Piwik\Plugins\Installation\Controller->systemCheck(...) called at [:]
#10 call_user_func_array(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/FrontController.php:577]
#11 Piwik\FrontController->doDispatch(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/FrontController.php:86]
#12 Piwik\FrontController->dispatch(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Installation.php:95]
#13 Piwik\Plugins\Installation\Installation->dispatch(...) called at [:]
#14 call_user_func_array(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/EventDispatcher.php:116]
#15 Piwik\EventDispatcher->postEvent(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/EventDispatcher.php:179]
#16 Piwik\EventDispatcher->postPendingEventsTo(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/Plugin/Manager.php:847]
#17 Piwik\Plugin\Manager->reloadPlugins(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/Plugin/Manager.php:636]
#18 Piwik\Plugin\Manager->loadPlugins(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/Plugin/Manager.php:102]
#19 Piwik\Plugin\Manager->loadActivatedPlugins(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/FrontController.php:324]
#20 Piwik\FrontController->init(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/dispatch.php:33]
#21 require_once(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/index.php:46]

There is an error. Please report the message (Piwik 2.7.0) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).

Warning: shell_exec() [function.shell-exec]: Unable to execute 'stat -f -c "%T" /proc 2>/dev/null' in /home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti/Process.php on line 216

Backtrace -->
#0 Piwik\Error::errorHandler(...) called at [:]
#1 shell_exec(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti/Process.php:216]
#2 Piwik\CliMulti\Process::isProcFSMounted(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti/Process.php:157]
#3 Piwik\CliMulti\Process::isSupported(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/CliMulti.php:163]
#4 Piwik\CliMulti->supportsAsync(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/SystemCheck.php:188]
#5 Piwik\Plugins\Installation\SystemCheck::getSystemInformation(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Controller.php:406]
#6 Piwik\Plugins\Installation\Controller::getSystemInformation(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Controller.php:604]
#7 Piwik\Plugins\Installation\Controller->setupSystemCheckView(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Controller.php:119]
#8 Piwik\Plugins\Installation\Controller->systemCheck(...) called at [:]
#9 call_user_func_array(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/FrontController.php:577]
#10 Piwik\FrontController->doDispatch(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/FrontController.php:86]
#11 Piwik\FrontController->dispatch(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/plugins/Installation/Installation.php:95]
#12 Piwik\Plugins\Installation\Installation->dispatch(...) called at [:]
#13 call_user_func_array(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/EventDispatcher.php:116]
#14 Piwik\EventDispatcher->postEvent(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/EventDispatcher.php:179]
#15 Piwik\EventDispatcher->postPendingEventsTo(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/Plugin/Manager.php:847]
#16 Piwik\Plugin\Manager->reloadPlugins(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/Plugin/Manager.php:636]
#17 Piwik\Plugin\Manager->loadPlugins(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/Plugin/Manager.php:102]
#18 Piwik\Plugin\Manager->loadActivatedPlugins(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/FrontController.php:324]
#19 Piwik\FrontController->init(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/core/dispatch.php:33]
#20 require_once(...) called at [/home/luzhajka/luzhajka.com/docs/stats-info/index.php:46]