Since im a nice guy here is how you would fix it by the way guys if you aren't going to help dont post.
Alright load WarZ_Server.sln then you should get that error click OK then select the solution on the left that gave error you should then see this.
http://i.gyazo.com/45cbb786bf47e561549ca7b4ce33551b.png
Then you will see at the bottom of my image you can change the full path click browse then set it your directory so example: C:\WarZ\src\Eternity and select Eternity.vcproj then right click it and click reload and it should now be fixed enjoy.