add a Signature

I want to add a Signature to my profile, but if I click via My Settings Edit Signature, i received the following Error-message:

Fatal error: Declaration of vB_SignatureParser::parse($text) must be compatible with vB_BbCodeParser::parse($text, $forumid = 0, $allowsmilie = true, $isimgcheck = false, $parsedtext = '', $parsedhasimages = 3, $cachable = false, $htmlstate = null) in /home/eforum/public_html/includes/class_sigparser.php on line 146


Am I doing something wrong?