Warning - preg_match(): Unknown modifier 'p' - Piwik 2.11.0

General questions
1

Is anybody else having the following error while in admin pages?


WARNING CoreHome[2015-03-02 14:41:23] [202a2] C:\wamp\www\piwik\core\Url.php(252): Warning - preg_match(): Unknown modifier 'p' - Piwik 2.11.0 - Please report this message in the Piwik forums: http://forum.piwik.org (please do a search first as it might have been reported already)
2

Ok this problem isn’t specific to 2.11.0. I did an upgrade to see if it was.

In my config file, I had a slash in the url of a trusted host. That was casusing the problem.