Comes up every couple of days:
This is because gvfs is not a filesystem it is a memory resident tree
representing configuration controls for gnome.
Root doesn't have access because the process presenting the tree doesn't support it.
You will always get this error when you are logged via the GUI and using
gnome. A varient exists, I believe, for KDE.
You will also get this error if the user is terminated (kill -9) because
the process implementing the filesystem is aborted, leaving the mountpoint corrupted in the system cache (dentry I believe it is).