I cannot play it at all because everytime i join I get this message, is this a problem with pak or what?
you could try these troubleshooting steps
https://support.steampowered.com/kb_article.php?ref=2117-ILZV-2837
you could try these troubleshooting steps
https://support.steampowered.com/kb_article.php?ref=2117-ILZV-2837