I get error in my log file

"Younes Daneshbod" (daneshbod@usa.net)
Sat, 24 Oct 1998 00:34:16 +0200

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Whenever I run mgetty I receive this error in my log file:

10/24 00:56:08 yS1    CND: OK+AFs-0a+AF0-ATS0+AD0-0Q0+ACY-D3+ACY-C1+AFs-0d+AF0-
10/24 00:56:08 yS1    CND: ATS0+AD0-0Q0+ACY-D3+ACY-C1+AFs-0d+AF0AWw-0a+AF0-ERROR
10/24 00:56:08 yS1  found action string: +AGAAYA-ERROR''
10/24 00:56:08 yS1  init chat failed, exiting...: Invalid argument
10/24 00:56:08 +ACMAIwAjACMAIw- failed in mg+AF8-init+AF8-data, dev+AD0-ttyS1, pid+AD0-1354

I have Redhat 5.1 and USR 33.6 (the first series).
Thanks