Mailpress Swift.php on line 73 problem

All the plugins are always updated. When I upgrade from wordpress 2.8.4 -> 2.8.6 I receive this message at the bottom of the page when I approve comments

Fatal error: Uncaught exception ‘LogicException’ with message ‘Passed array specifies a non static method but no object’ in /home/inrajaka/public_html/wp-content/plugins/mailpress/mp-includes/class/swift/classes/Swift.php:73 Stack trace: #0 /home/inrajaka/public_html/wp-content/plugins/mailpress/mp-includes/class/swift/classes/Swift.php(73): spl_autoload_register() #1 /home/inrajaka/public_html/wp-content/plugins/mailpress/mp-includes/class/swift/swift_required.php(32): Swift::registerAutoload(Array) #2 /home/inrajaka/public_html/wp-content/plugins/mailpress/mp-includes/class/MP_Mail.class.php(721): require_once(‘/home/inrajaka/…’) #3 /home/inrajaka/public_html/wp-content/plugins/mailpress/mp-includes/class/MP_Mail.class.php(189): MP_Mail->swift_processing() #4 /home/inrajaka/public_html/wp-content/plugins/mailpress/mp-includes/class/MP_Mail.class.php(33): MP_Mail->start() #5 /home/inrajaka/public_html/wp-content/plugins/mailpress/MailPress.php(445): MP_Mail->send() #6 /home/inrajaka/public_html/wp-content/plugins/mailp in /home/inrajaka/public_html/wp-content/plugins/mailpress/mp-includes/class/swift/classes/Swift.php on line 73