Why is there only a period of time to upload after installing vsftpd in Ubuntu?

I used this tutorial: ide/ftp-server.html" rel=" nofollow noreferrer "> https://help.ubuntu.com/lts/s.. After finishing that tutorial, I can"t upload to VPS with FTP installed with my windows 10. Then do not know where to see it, execute sudo chmod-R 777 ftp (/ srv/files/ftp) to upload, and then can not upload after a while.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bea20e-319e2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bea20e-319e2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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