Nakashima

I am also getting an error with my code while trying to display something on the page The error is WARNING: mysqli_num_rows() expects parameter 1 to be mysqli_result, bool given in C:\xampp\htdocs\ECE\ramonsys\include\database.php on line 98 the code is public function num_rows() { $cur = $this->executeQuery(); return mysqli_num_rows($cur)); } what can I do to fix the problem? Thank you!