Xcode can't open my project

I built an application on a windows machine and then generated the Xcode project and import it to a MAC, but when I try to open it I get this error "Project cannot be opened because the project file cannot be parsed" If anyone has a solution, I'd appreciate it. I'm using OS X El Capitan, XCode 7.2 and Unity 5.0.2. I use that version of unity because vuforia prefabs would make Unity last version crash.