Error message: Error getting used storage of client?

Hello,

with a client i’ve got this error message by email :
Subject : [UrBackup] Quota enforcement failed
Message :

Quota enforcement report for client “Client-***” (id=9)
Error getting used storage of client

What does it mean ?

Regards

Maybe the statistics are messed up? (Negative on the statistics screen for that clients)
You can either ignore that mail, or press the recalculate statistics button.
This will be better with the next major version.

I am getting the same notification with 1.4.9 server version and recalculation did not helped - did you get read of this notification ?