Fatal error: Uncaught Error: Call to undefined function CleantalkSP\SpbctWP\Scanner\OSCron\Shell\shell_exec() in /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Scanner/OSCron/Shell/OSCronGetEnvCron.php:20
Stack trace:
#0 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Scanner/OSCron/OSCronModel.php(225): CleantalkSP\SpbctWP\Scanner\OSCron\Shell\OSCronGetEnvCron::get()
#1 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Scanner/OSCron/OSCronModel.php(49): CleantalkSP\SpbctWP\Scanner\OSCron\OSCronModel::getEnvCron()
#2 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Scanner/OSCron/OSCronModel.php(24): CleantalkSP\SpbctWP\Scanner\OSCron\OSCronModel::getEnvTasks()
#3 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Scanner/ScannerQueue.php(1045): CleantalkSP\SpbctWP\Scanner\OSCron\OSCronModel::run()
#4 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Scanner/ScannerQueue.php(196): CleantalkSP\SpbctWP\Scanner\ScannerQueue->os_cron_analysis()
#5 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/inc/spbc-scanner.php(60): CleantalkSP\SpbctWP\Scanner\ScannerQueue::controllerBackground('805045920', 'os_cron_analysi...', 0, 700)
#6 [internal function]: spbc_scanner__controller('805045920')
#7 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/Common/Cron.php(121): call_user_func('spbc_scanner__c...', Array)
#8 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/Common/Cron.php(54): CleantalkSP\Common\Cron->runTasks()
#9 /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/security-malware-firewall.php(372): CleantalkSP\Common\Cron->execute()
#10 /customers/1/7/5/ricoco.nl/httpd.www/wp-settings.php(526): include_once('/customers/1/7/...')
#11 /customers/1/7/5/ricoco.nl/httpd.www/wp-config.php(96): require_once('/customers/1/7/...')
#12 /customers/1/7/5/ricoco.nl/httpd.www/wp-load.php(50): require_once('/customers/1/7/...')
#13 /customers/1/7/5/ricoco.nl/httpd.www/wp-blog-header.php(13): require_once('/customers/1/7/...')
#14 /customers/1/7/5/ricoco.nl/httpd.www/index.php(17): require('/customers/1/7/...')
#15 {main}
  thrown in /customers/1/7/5/ricoco.nl/httpd.www/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/SpbctWP/Scanner/OSCron/Shell/OSCronGetEnvCron.php on line 20