Errors when running Apps in ASP.NET MVC CORE

I am recently set up Visual Studio 2017, but When i try to start ASP.NET MVC CORE Project that runtime error appears:

System.MissingMethodException occurred HResult=0x80131513 Message=Method not found: 'System.IServiceProvider Microsoft.Extensions.DependencyInjection.ServiceCollectionContainerBuilderExtensions.BuildServiceProvider(Microsoft.Extensions.DependencyInjection.IServiceCollection)'. Source= StackTrace: at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build() at WebApplication4.Program.Main(String[] args) in C:\Users\qqq\documents\visual studio 2017\Projects\WebApplication4\WebApplication4\Program.cs:line 14

and when i try to run another ASP.NET MVC CORE Project this error message appears:

Unable to start process C:\Program Files\dotnet\dotnet.exe. The web server request failed with status code 500, Internal Server Error. The full response has been written to C:\Users\qqq\AppData\Local\Temp\HttpFailure_04-02-08.html.

Are these errors because of IIS Error or something in configuration ?