Problem with sending mail with PEAR Mail.

I have problem with sending mail from my webpage using Mail in Pear. I get the error:
Strict standards: Non-static method PEAR::isError() 
should not be called statically, assuming $this from incompatible 
context in C:\wamp\bin\php\php5.5.12\Pear\pear\Mail\smtp.php on line 365

I have been searching all over on google but not got an answer. Do you know what it can depend on?

thanks in foreward!

/Johan Salomonsson

My code: 

<?php

include("Mail.php");
    $mail_settings['debug'] = FALSE;
    $from="[email protected]";
    $to="[email protected]";
    $subject="Hej!";
    $body="Hi.\n\nHow are you?";

    $host="smpt1.servage.net";
    $port="25";
    $username="[email protected]";
    $password="*******";
    $headers=array('From' =>$from, 'To'=> $to, 'Subject'=> $subject);
    
    
    $smtp= @Mail::factory('smtp',array('host'=>$host,'port'=> $port,
        'auth'=>true, 'username'=>$username, 'password'=> $password));
    
    $mail = $smtp->send($to, $headers, $body); 
    
    if (@PEAR::isError($mail)){
    echo("<p>".$mail->getMessage()."</p>");    
    } else {
        echo("<p>Message successfully sent!</p>");    
    }