So, our team was having this problem, and figured others might be, too, so we decided on sharing the solution. If you get an error in your project, along the lines of: C:\Users{user}{project_location}{project_name}\build.xml:28: Cannot find C:\Users{user}{project_location}{project_name}${wpilib.ant.dir}\build.xml imported from C:\Users{user}{project_location}{project_name}\build.xml, then there’s a very simple solution. Go to File -> New -> Other, find Robot Java Project and select it, name it whatever, it doesn’t matter, just not whatever your main project is named, and after the project has been made, delete it. This should resolve your problem on all your projects.