ocserv cannot auth with pam radius

[yjzqzu at 163.com (leo)]

I was trying to connect my ocserv with radius pam auth.

in /etc/pam.d/ocserv

I have

auth    required        /lib/security/pam_radius_auth.so

When I connect to the server it shows
 ocserv[2623]:PAM-auth pam_auth_pass: Authentication service cannot 
retrieve authentication info

What should I do?

If addtional information is needed.Please let me know.