Command Syntax Problem with tethereal

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Hallo,
I have a syntax problem with tethereal. =85Maybe ?

I want setup on console session (Windows and Solaris OS) the following
command structure.

 Tethereal -b duration:60 filesize:1000 files:5 -i hme0 -N nt -w
/var/tmp/hme0.pcap

But repeatedly i became the following answer on stdout.
"tethereal: Ring buffer requested, but capture isn't being saved to a
file."

Whats wrong?
Can you give me an command example? It is nothing to find in the man
Page and user guide.

Regards
-----------------------------------------------
Cristian H=F6ffelmann