The debug mode is URL but there is no URL specified

In Microsoft Web Developer 2010 Express I saw this error:

The debug mode is URL but there is no URL specified. Please specify a URL using the project’s Debug property page.

This happened whenever I tried Start debugging after I changed from the 4.0 runtime to the 2.0 runtime, but switching back to 4.0 didn’t help.

Not being familiar with the Microsoft IDE, it took me a few minutes to figure this out. The solution is actually simple. Click WebsiteStart OptionsUse current page.

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