asterisk users - Dec 2009 - Failed to record Radius CDR record!

hi,all

i have load cdr_radius.so successfully! but another error occur.

  -- Executing [4321 at tutorial:1] Dial("SIP/ivan-0a07dc80",
"SIP/test") in new stack
  -- Called test
  -- SIP/test-0a08b0f0 is ringing
  -- SIP/test-0a08b0f0 answered SIP/ivan-0a07dc80
  -- Packet2Packet bridging SIP/ivan-0a07dc80 and SIP/test-0a08b0f0

[Dec 24 09:30:32] ERROR[10747]: cdr_radius.c:227 radius_log: Failed to
record Radius CDR record!
 == Spawn extension (tutorial, 4321, 1) exited non-zero on
'SIP/ivan-0a07dc80'

it says "Failed to record Radius CDR record". Could you tell me ,
what's wrong with it?

-- 
Regards,
Sucan