I have website configured in IIS 7.5 i want to edit some of

Question

I have configure ASP.NET website on Windows server 8 with IIS 7.5 Now i want to make some changes i open the explore windows from hosted website using IIS and then copy that location and open this project in VS 2008 , when i build it , then it gives that erro r

Error 4 Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive. C:\HostingSpaces\admin1\kk.hhh.pro\wwwroot\web.config 33

What would be the cause i think that it is build using VS 2015 and i am opening it in VS 2008 that would be the issue can anyone assists me