Unable to launch the IIS Express Web server

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I had the exact same problem.
The reason – bad IIS config file.

Try deleting the automatically-created IISExpress folder, which is usually located at %userprofile%/Documents, e.g. C:\Users\[you]\Documents\IISExpress.

Don’t worry, VS should create it again – correctly, this time – once you run your solution again.

EDIT: Command line for deleting the folder:

rmdir /s /q "%userprofile%\Documents\IISExpress"

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