Inherting Modules - gwt-websockets

Hi,
I just tried using GWT with WebSockets. I took the gwt-websocket .jar
of the gwt-comet project [1]. I basically followed the example here
[2]. If I want to compile my Project eclipse breaks with error
message:
Unable to find 'net/zschech/gwt/websockets/WebSockets.gwt.xml' on your
classpath; could be a typo, or maybe you forgot to include a classpath
entry for source?
I`ve included everthing in my BuildPath an added this line to
my .gwt.xml
<inherits name="net.zschech.gwt.websockets.WebSockets"/>

Where is the fault?

P.S.: Sorry for my bad english.

[1] http://code.google.com/p/gwt-comet/
[2]http://code.google.com/p/gwt-comet/wiki/WebSockets

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