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Question

When I try to startup my project w/ IIS Express I get the error:

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Answer 1

VS 2017

• Project Properties
• Debug
• Launch Browser //http://localhost:5000 or whatever
• Uncheck Enable SSL
• App Url //http://localhost:5000 or whatever. make sure same with Launch Browser url
• Save and Close
• Open launchsettings.Json under Properties (Solution Explorer)
• Make sure old settings is deleted. If not delete it.
• Save and Close.

Hope it helps

Answer 2

I encountered this error when trying to launch a downloaded project in which the target framework version was different from the version installed in my environment. I opened the “.csproj” file in a text editor, corrected the version in the “TargetFramework” node and saved the modified file. In order to be sure to make the changes take effect, I closed and reopened the Visual Studio solution containing the project. Then the project started correctly.