Ethereal-users: [Ethereal-users] unable to parse filter string

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From: Senthil Kumar <psk@xxxxxxxxxx>
Date: Tue, 05 Mar 2002 12:25:33 -0600
I am getting the warning screen:

Unable to parse filter string(parse error) when i start to capture with the filter string
ether proto ppp

I checked with the tcpdump & the syntax look ok.
Is there anyhting i am missing here?