The WP Twin plugin uses the PHP system and exec functions. These functions may be blocked/disabled in your custom php.ini file or your web host may have these functions disabled in the Server’s php.ini file. To allow these php functions to be enabled / allowed on your website remove/delete them from the disable_functions directive in your custom php.ini file >>> disable_functions = shell_exec, show_source, passthru, popen, pclose, pcntl_exec. If you do not have a custom php.ini file or have not created a custom php.ini file for your website contact your Web host and ask them to assist you with this issue.
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