Make sure your level follows real-world Geometry and make sure you linked it and I had something of that sort and it was because I was building over a another level. If you made it previosuly delete it. So try that.
OK guys, I'm desperate. Can someone make a tutorial or something on how to close edges? I'll gladly send my g-max file so you can fix it. All these errors are so confusing.
Well it isnt that hard it , you import the .wrl of the maap name in ur CE folder and uncheck Reset Scene, there is also a small tutorial that comes with the HEK.