Clear text password not available issue

[ann kok]

Hi

I am trying new  FreeRADIUS Version 2.0.4 and testing Ntrping software

The radius log keep saying that

 Auth: Login incorrect (rlm_chap: Clear text password not available

I already tried different password attribute

eg: 
CHAP-Password, Cleartext-Password and User-Password

All won't work

I am also seaching the google and FAQ too

Could you help what I am doing wrong?

Thank you