P3D v4 SbuilderX error when trying to compile objects

When I try to compile objects in SBuilderX I get this error:"SBuilder - Globally Exception: Argument "Lenght" must be greater or equal to zero. This was an unexpected error that can lead to unpredictable results." and SBX closes. I placed 100s of objects and now I don't know what's the problem. What could be the problem?