Error 8500035 by syncing a folder

We use Boxifier with serveral users on Windows Server (2011) with Boxifier version 1.5.22 and Dropbox version 13.4.21. It works fine for every user exept one. When he is trying to sync a folder with Boxifier he gets the following error code 8500035 after pressing ‘OK’ the folder isn’t syncing. When someone else syncs the same folder everything works fine. What could be the problem?

The problem seems to be solved by a boxifier update to version 1.5.24