Module 3 milestone1 unable to change ownership, and when trying to run without sudo I am getting error 500

output:
crio-user@divyashahi139:~/workspace/QBox$ chmod +x vsftpd_v1
crio-user@divyashahi139:~/workspace/QBox$ chown root vsftpd_v1 vsftpd_v1.conf
chown: changing ownership of ‘vsftpd_v1’: Operation not permitted
chown: changing ownership of ‘vsftpd_v1.conf’: Operation not permitted
crio-user@divyashahi139:~/workspace/QBox$ ./vsftpd_v1 vsftpd_v1.conf
500 OOPS: vsftpd: must be started as root (see run_as_launching_user option)

This is the output I am getting , I am unable to change ownership, and when trying to run without sudo I am getting error 500, please help stuck in this for hours.

There is a syntax error in your command. Please use sudo while assigning permissions.