Mysql_fetch_array () expects parameter 1 to IS resource, boolean given in D: What's the solution? Solutions

Mysql_fetch_array () expects parameter 1 to IS resource, boolean given in D: What's the solution?
Mysql_fetch_array () expects parameter 1 to BES resource, boolean given in D:\xampp\htdocs\4.php on line 12

What is wrong, please? How to correct? Thank you, everyone.

The code is as follows:

$con = mysql_connect ("localhost", "root", "");
Connect via server locahost, user name is root, no password

if (! $con)
{
Die (' Could not connect: '. Mysql_error ());
}//If unsuccessful, displays an error
mysql_select_db ("CRMs", $con);//Select Database
$result = mysql_query ("SELECT * from Cno");//Find

while ($row = Mysql_fetch_array ($result))//Print
{
echo $row [' Cno ']. " " . $row [' Cno '];
echo "
";
}

Mysql_close ($con);
?>

------Solution--------------------
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Access denied for user "@ ' localhost ' to database ' CRMs '

How should such a mistake be changed?

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