Publish Web Project using MSBuild command

[Abhi]

We are working on a web application. It is in VS2008. We are able to publish
the project from IDE.
But when we tried to publish it from Command Prompt using msbuild command,
It gives us this following error message:-

"Skipping UnPublishable Project"

We are using this command

msbuild /target:publish /p:PublishUrl="http://localhost/TabContainerRnD"
/p:PublishDir="C:\inetpub\wwwroot\TabContainerRnD"

We have also tried to publish on remote server using command

msbuild /target:publish /p:PublishUrl="//<RemoteServer>/TabContainerRnD"

but it gives same error.

waiting for response.

Thank You In Advance.

Abhi