MS-CHAPv2 error, clues ?

[Apu islam]

Here is the error message I am getting when I am
trying to authenticate,

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Processing the authenticate section of radiusd.conf
modcall: entering group MS-CHAP for request 1
  rlm_mschap: Told to do MS-CHAPv2 for apu with
NT-Password
  rlm_mschap: FAILED: MS-CHAP2-Response is incorrect
  modcall[authenticate]: module "mschap" returns
reject for request 1

--------------------
Any clues would be appreciated.

Apu

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 Apu Islam
( E Pluribus Unum)