mysql_fetch_row(): supplied argument is not a valid MySQL result resource

Hi All,

I am new to PHP, I have tried to look for similar error but could not find
anwers that helped me. I am getting the following error:
Warning: mysql_fetch_row(): supplied argument is not a valid MySQL result
resource in C:\ ... register.php on line 109

Here is my code snippets:
1.) my connection to the database is per page. the first three lines of code
in my script is :

<?php
session_start();
mysql_connect("localhost", "USER", "PASS") or die(mysql_error());
mysql_select_db("DATABASE") or die(mysql_error());

which means that I do not use persistant connections

2.) the code that creates the error is this:

$checkSQL = "SELECT COUNT(`EmailAddress`) AS `CountOfRows` FROM
`printerclient` WHERE `EmailAddress` = '$email'";
$sqlresult = mysql_query($checkSQL);
$sqlrow = mysql_fetch_row($sqlresult); <<-- THIS IS LINE 109 -->>
if ($sqlrow['CountOfRows'] == 0) {
$IsUnique = true;
} else {
$registerMessage = "This email address is already registered";
}

What I have tried to find out what is wrong:
1.) If I change the following line

$sqlresult = mysql_query($checkSQL);
to this
$sqlresult = mysql_query($checkSQL) or die(mysql_error());

then I get the following message
Query was empty
when I echo the $checkSQL and copy it from the screen and run it in
phpMyAdmin it run OK and returns CountOfRows = 2

The SQL statement generated looks like this

SELECT COUNT(`EmailAddress`) AS `CountOfRows` FROM `printerclient` WHERE
`EmailAddress` = 'test@test.com'

I do not know what is wrong, can somebody help?

Thanks.
Peter.