Property groups needs accessing to internet in order to validate xml
You've got two option
1- ensure you are accessing url defined into PropertyGrups.xml ( at begining something like http://www.openkm.com/dtd/ )
2- assign the url as local file -> read here how doing it http://wiki.openkm.com/index.php/Troubleshooting
You've got two option
1- ensure you are accessing url defined into PropertyGrups.xml ( at begining something like http://www.openkm.com/dtd/ )
2- assign the url as local file -> read here how doing it http://wiki.openkm.com/index.php/Troubleshooting