http://stackoverflow.com/questions/5730412/error-when-running-the-nuget-exe-command
Ok, so this turned out to be a really weird error which I still don’t know why it happened. But I do know the solution. What I had done was put the nuget.exe file in c:\windows\system32. I did that so I didn’t have to update the %PATH% environment variable, or that was my thought at least. The part about not updating the environment variable worked fine, but for some reason NuGet wouldn’t run from that folder for me. When putting the nuget.exe file in a separate folder under c:\Program files (x86)and adding that folder to the %PATH%, it started working just fine.
Weird error.
很奇怪的错误，nuget.exe不能放在system32下面。直接换到C:\Windows下就可以
