I am assuming you are seeing “No paths to backup configured” on the Status page of the web interface.
That message is in reference to last time it tried to run.
Did you check the settings for the client on the web interface to see if the path is defined there?
If not, you can set it there. Sometimes it takes a bit to sync up.
Yes, I see “No paths to backup configured” on the status page on server. I tried check box “Separate settings for this client” for that linux client and setup parameters “Included files (with wildcards)” and “Default directories to backup”, then restart server and client services, waited a some hours but nothing. The same error