shell_exec(): Cannot execute using backquotes in Safe Mode

[mattab]

Error reported in the forum by a user:

shell_exec(): Cannot execute using backquotes in Safe Mode

Full error was:

Warning: shell_exec(): Cannot execute using backquotes in Safe Mode in /home/admin/domains/hetespellen.be/public_html/piwik/core/CliMulti/Process.php on line 170

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [:]
#1 shell_exec(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/core/CliMulti/Process.php:170]
#2 Piwik\CliMulti\Process::isSystemNotSupported(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/core/CliMulti/Process.php:153]
#3 Piwik\CliMulti\Process::isSupported(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/core/CliMulti.php:163]
#4 Piwik\CliMulti->supportsAsync(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/core/CliMulti.php:46]
#5 Piwik\CliMulti->__construct(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/plugins/Installation/SystemCheck.php:187]
#6 Piwik\Plugins\Installation\SystemCheck::getSystemInformation(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/plugins/Installation/Controller.php:406]
#7 Piwik\Plugins\Installation\Controller::getSystemInformation(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/plugins/Installation/Controller.php:604]
#8 Piwik\Plugins\Installation\Controller->setupSystemCheckView(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/plugins/Installation/Controller.php:429]
#9 Piwik\Plugins\Installation\Controller->systemCheckPage(...) called at [:]
#10 call_user_func_array(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/core/FrontController.php:576]
#11 Piwik\FrontController->doDispatch(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/core/FrontController.php:86]
#12 Piwik\FrontController->dispatch(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/core/dispatch.php:34]
#13 require_once(...) called at [/home/admin/domains/hetespellen.be/public_html/piwik/index.php:47]