If you installed Extradium 2013 in a multi-server farm, you might notice errors in the SharePoint ULS logs such as the following one:
Failed to find the XML file at location '15\Template\Features\RioLinx.Extradium.Admin.UpdateAdminSiteMap\feature.xml'
Failed to find the XML file at location '15\Template\Features\RioLinx.Extradium.Admin.UpdateAdminSiteMap\feature.xml'
The root cause of this error (which doesn't prevent Extradium from running properly though) is that the riolinx.extradium.admin.wsp is only deployed to the servers that run the SharePoint Central Administration Site (there is typically only one such server in a SharePoint farm).
In order to prevent these warning/error messages from appearing in the SharePoint log files, please take the following steps:
1. Navigate to the SharePoint Central Administration
2. Select System Settings ==> "Manage farm solutions".
3. Click on riolinx.extradium.admin.wsp and deploy the solution to any web application.
This will deploy the missing features to all front-end web servers and you should no longer see such entries in the SharePoint ULS logs.