I get the same error when trying to build a "Hello World!"-like single page app. I've installed the VS templates today on this machine. How can I update them?
If the problem persist, you can also try to reinsert your existing .fs source files into an up-to-date template.
Did you try to close and reopen Visual Studio after updating your project? Unfortunately because of the way VS works, after updating WebSharper it still uses the old build task, and it needs to be restarted.
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