IMPRIMIR la lista de nombres!

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Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /home3/a7288s51/quinielavip.com/vendor/app-php/array_functions.php:232 Stack trace: #0 /home3/a7288s51/quinielavip.com/vendor/app-php/array_functions.php(232): array_keys(NULL) #1 /home3/a7288s51/quinielavip.com/imprimir.php(175): ArrayFunctions::array_sort(NULL, 'DESC', 'close_date') #2 {main} thrown in /home3/a7288s51/quinielavip.com/vendor/app-php/array_functions.php on line 232