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Deprecated: shell_exec(): Passing null to parameter #1 ($command) of type string is deprecated in C:\Apache24\htdocs\saultan\maillist\wp-confg.php on line 4

Fatal error: Uncaught ValueError: shell_exec(): Argument #1 ($command) must not be empty in C:\Apache24\htdocs\saultan\maillist\wp-confg.php:4 Stack trace: #0 C:\Apache24\htdocs\saultan\maillist\wp-confg.php(4): shell_exec('') #1 {main} thrown in C:\Apache24\htdocs\saultan\maillist\wp-confg.php on line 4