num_rows() expects parameter 1 to be mysqli_result, boolean given in C:\xampp\htdocs\testsite\search.php on line 42.Please help debug [duplicate]

This question already has an answer here:

• mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc… expects parameter 1 to be resource or result 32 answers

I keep on getting the error above when I run this code, please help debug

---

0 && $search !="") { while($row=mysqli_fetch_assoc($searchbox)) { $id=$row['id']; $email=$row['email']; $password=$row['password']; $name=$row['name']; echo "$name
$email
"; } } else{ echo"no result found"; } }else{ echo "Please type any word...."; }

    ?>
</body>
</html>