my php code runnig nicely without any error in my local host but not running on server !!

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PHP

Hi friends !!

my php code runnig nicely without any error in my local host but not running on server !!
it shows error where i use php's mysqli_numrows(),mysqli_fetchrows() etc, it showing errors like this
Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in /home/maxdudes/public_html/gujaratraksha.in/index.php on line 127

Warning: mysqli_fetch_row() expects parameter 1 to be mysqli_result, boolean given in /home/maxdudes/public_html/gujaratraksha.in/index.php on line 131

Warning: mysqli_fetch_row() expects parameter 1 to be mysqli_result, boolean given in /home/maxdudes/public_html/gujaratraksha.in/index.php on line 136

my code is here

<pre lang="PHP">
include_once("db_conx.php");                              
$xbt = "SELECT * from photo_upload";
$query1 = mysqli_query($con,$xbt);
$rows = mysqli_num_rows($query1); 
   
$last_date = "SELECT SrNo,Upload_Date from photo_upload WHERE SrNo='$rows'";
$query_date = mysqli_query($con,$last_date);

$last_inserted_date = mysqli_fetch_row($query_date);
echo $last_inserted_date[1];

$sql = "SELECT Img_Location from photo_upload WHERE Upload_Date = '$last_inserted_date[1]'";
$query = mysqli_query($con,$sql);
while($result = mysqli_fetch_row($query)){		
echo '<img src="'.$result[0].'" alt="" class="col-lg-12" >';
}