RADIUS AUTHENTICATOR---need HELP using MSCHAP and NTPASSWORD

[ego seek]

I use Squid and RADIUS.

Squid use Squid_radius_authenticator to authenticate a client and write a
log in which there is the username and the http request.

THE PROBLEM IS:
In the radcheck table i put a value: "AUTH-TYPE" and set "MS-CHAP" for the
user. his password is stored in NT-HASH format.
when the authenticator try to authenticate the user, this is the output


".......
rad_check_password:  Found Auth-Type MS-CHAP
auth: type "MS-CHAP"
  Processing the authenticate section of radiusd.conf
modcall: entering group MS-CHAP for request 6
  rlm_mschap: No User-Password configured.  Cannot create LM-Password.
  rlm_mschap: Found NT-Password
  rlm_mschap: No MS-CHAP-Challenge in the request
  modcall[authenticate]: module "mschap" returns reject for request 6
modcall: leaving group MS-CHAP (returns reject) for request 6
auth: Failed to validate the user.
Login incorrect:[username/password]"


can anybody help me?
please.
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