"Client denied by server configuration" since update to Piwik 2.4.0 (no replies)

Hi since I updated to version 2.4.0 i get the following error:

[Wed Jul 02 14:26:14 2014] [error] [client 8?.2?.1?.3?] client denied by server configuration: / path to my Piwik/plugins/MultiSites/angularjs/dashboard/plugins, referer: http://tracking.sbg-is.de/plugins/MultiSites/angularjs/dashboard/dashboard.html?cb=91781cbf58daa9fde9ebe89224884d52
[Wed Jul 02 14:26:14 2014] [error] [client 8?.2?.1?.3?] client denied by server configuration: / path to my Piwik/plugins/MultiSites/angularjs/dashboard/plugins, referer: http://tracking.sbg-is.de/plugins/MultiSites/angularjs/dashboard/dashboard.html?cb=91781cbf58daa9fde9ebe89224884d52
[Wed Jul 02 14:26:14 2014] [error] [client 8?.2?.1?.3?] client denied by server configuration: / path to my Piwik/plugins/MultiSites/angularjs/dashboard/plugins, referer: http://tracking.sbg-is.de/plugins/MultiSites/angularjs/dashboard/dashboard.html?cb=91781cbf58daa9fde9ebe89224884d52
[Wed Jul 02 14:26:14 2014] [error] [client 8?.2?.1?.3?] client denied by server configuration: / path to my Piwik/plugins/MultiSites/angularjs/dashboard/plugins, referer: http://tracking.sbg-is.de/plugins/MultiSites/angularjs/dashboard/dashboard.html?cb=91781cbf58daa9fde9ebe89224884d52
[Wed Jul 02 14:26:14 2014] [error] [client 8?.2?.1?.3?] client denied by server configuration: / path to my Piwik/plugins/MultiSites/angularjs/dashboard/plugins, referer: http://tracking.sbg-is.de/plugins/MultiSites/angularjs/dashboard/dashboard.html?cb=91781cbf58daa9fde9ebe89224884d52

The Dashboard for all Website doesn't list any Websites. If I choose an Website from the Dropdown list I can see the Visitors.