Disk full - please upload later

Disk is indeed not full at all: usage:

Disk Usage
347.74 MB / 75 GB (0.45%)
Database Disk Usage
16.58 MB / 74.68 GB (0.02%)
Bandwidth
697.83 MB / ∞

What is this?

What random bug is this? Does not happen on other FTP servers. And I've used this one for months only gave error now.

I'm sure the error comes from the server (post a log file if you do not think so).

Please talk to the server administrator.