Plesk 12.x / Linux :: Failed To Copy Files Storage To Destination Path - Disk Quota Exceeded

I am having problems with two accounts, I get the following errors:

Code:
Failed to copy files storage to destination path. stderr: filemng: Cannot open destination file '/var/www/vhosts/domain.tld/httpdocs/index.html.Chn3rn' System error 122: Disk quota exceeded stdout: filemng: Cannot open destination file '/var/www/vhosts/domain.tld/httpdocs/index.html.Chn3rn' System error 122: Disk quota exceeded

I have run the command

Code:
quotacheck -avugfm

And the output from the command

Code:
df -i

is:

Code:
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/vzfs 20000000 1542375 18457625 8% /
/dev/simfs 20000000 1542375 18457625 8% /tmp
/dev/simfs 20000000 1542375 18457625 8% /var/tmp
none 1415577 113 1415464 1% /dev

I am at a loss, I don't know what else to try.