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I changed my ASP.NET web application to use Local IIS, instead of IIS Express. Now after re-opening the solution, the following error occurs while loading the application:
error : Project 'Atlas2' could not be opened because the Visual C# 2015 compiler could not be created. 'Atlas2' is already part of the workspace.
error : Project 'Atlas2' could not be opened because the Visual C# 2015 compiler could not be created. An item with the same key has already been added.
Would someone please help me how I can reload the project? I'm using Visual Studio Team Services (was TFS Online), if it helps.
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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. This worked for me.
I solved my problem. I unloaded the project and edited .csproj file. I did the following changes:
<UseIISExpress>false</UseIISExpress> to true<UseIIS>True</UseIIS> <IISUrl>http://localhost/MyWebApp</IISUrl> Then I reloaded the project. It worked. Actually it rolled back to use IIS Express.
150
The same problem occurred at my system and got solved by running The Visual Studio in administrator mode. The issue was IIS having the same host+port name as ASP.NET project and without administrator rights Visual Studio was not able add the website.
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