this means that there is an issue in the Dreamweaver Site Definition in the way the testing server is configured, most likely the problem is the URL Prefix for the testing server.
are you using a local or remote testing server?
I recommend using a local testing server, many host are problematic at best when trying them as a remote testing server in Dreamweaver.
the learning resources page has details on installing a local testing server, also see the "Defining a Dynamic Site in Dreamweaver" tutorial on the learning resources page.
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