500 OOPS: failed to open vsftpd log file:~/workspace/QBox/vsftpd.log

crio-user@ranapratap280695:~/workspace/QBox$ ls -l
total 220
rwxr-xr-x 1 crio-user crio-user 0 Feb 11 16:52 vsftpd.log
-rwxr-xr-x 1 root crio-user 139448 Jan 3 06:01 vsftpd_v1
-rwxr-xr-x 1 root crio-user 4734 Feb 13 18:58 vsftpd_v1.conf
-rw-r–r-- 1 crio-user crio-user 65035 Feb 2 14:57 vsftpd_v1.tar.gz

i have changed the permission still getting error while connecting with ftp?

Edit the 3 parameters in vsftpd.conf file

which one 3 parameters?

Refer to the office hours video link given in #announcements channel on slack

Have you restarted the Qbox server after killing it ?

After restarting same error.

If you want to open the file then you can use
sudo nano file_name