No access via AFP anymore

Yesterday, it happen that I lost the connection to MyCloud 2 TB via AFP. not sure what happend, the only change I did was to switch off DLNA and iTunesServer.

I can acces MyCloud via Dashboard, SSH and FTP

When I going the chk folder access in the dashboard menu, I see some icon greyed out, so wondering what could happen and how to fix it. 

thx 

if I try to change access setting I receive error code (400099)

Same error code as this case?

http://community.wd.com/t5/WD-My-Cloud/Share-function-failed-400099/td-p/680885

bullseye *thumbs up*