PHP Error

I am not sure what is wrong with the code below, but when ever I attempt to execute it I get the following error:

PHP Warning:  mysql_fetch_assoc() expects parameter 1 to be resource, boolean given in mysql.main.php on line 17

According to the PHP manual, I have mysql_fetch_assoc() written correctly. Not sure why this error is being thrown.

<?php

	// require the configurations file
	require(dirname(__FILE__) . "/configurations/config.inc.php");
	
	// open connection to mysql - source and destination
	$mysql_source_link_id = mysql_connect($argv[1], mysql_user, mysql_user_password);
	$mysql_destination_link_id = mysql_connect(destination_mysql_host, mysql_user, mysql_user_password);
	
	// open the databases for both - source and destination mysql instances
	$mysql_database_source = mysql_select_db($argv[2], $mysql_source_link_id);
	$mysql_database_destination = mysql_select_db(destination_database_name, $mysql_destination_link_id);
	
	// execute the select statement on the source
	$query_select = mysql_query($sql_select, $mysql_source_link_id); 
	
	for ($i=0; $i < ($row = mysql_fetch_assoc($query_select)); $i++) {
		
		echo $row["world_id"] . "\n";
		echo $row["room_id"] . "\n";
		echo $row["player_id"] . "\n";
		echo $row["timestamp"] . "\n";
		echo $row["is_blocked"] . "\n";
		echo $row["message"] . "\n";
		
	}
	
	mysql_free_result($query_select);
	
	// close connection to mysql - source and destination
	mysql_close($mysql_destination_link_id);
	mysql_close($mysql_source_link_id);

?>

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