UrBackup: File name too long (code: 36)


Hello all
I have 2 UrBackup Servers 2.2.11 running on QNAP NAS.
In one of the server i have several clients with backup error
" Error opening file… "/share//BACKUPS/PC257/180607-0857/.hashes… File name too long (code: 36)"
I moved one of the clients to my other Urbackup server and the backup had no errors at all.
Its strange because my 2 servers configuration look the same!

Any help will be appreciated.