Visual Studio 2017 error: Unable to start program, An operation is not legal in the current state

Question

After fresh installation of Visual Studio 2017 I tried to run .NET Core Web project and when trying to run it on Chrome I am getting this error:

Unabl

Answer 1

Incase you are not able to resolve the issue in any other way, then try this(it worked for me!):

Keep this below code into your web config file then rename value="yourwebformname.aspx"

else Try: