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 ive used this one for months only gave error now.