[SOLVED] Supplied argument is not a valid MySQL resource

[moon 111]

For some reason the following generates this error:

 

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in ... on line 18

 

<?php
$q = "SELECT * FROM category";

$r = mysql_query($q); // Line 18
?>

 

and I connect to the database earlier on:

 

<?php
$server = '**';
$dbuser = '**';
$dbpass = '**';
$db = '**';

mysql_connect($server, $dbuser, $dbpass) or die(mysql_error());
mysql_select_db($db) or die(mysql_error());
?>

 

What is the problem?

[discomatt]

$r = FALSE

 

mysql_query() will return FALSE on an non-successful query. Use mysql_error() to check to see what's going wrong.

[moon 111]

Thank you very much. I simply forgot to upload a file after updating it...