Hi!
I got this error for one of my project, it seems iOS is missing from UnityEditor namespace, is this intentional as there is no support yet or is it a bug?
Thank you!
Just wanting to follow up on this - I’m using the latest release (unity-editor-5.1.0f3+2015091601) and getting the same error message. Wondering if this might be in the next release or even a rough time lime where it might be?
I have a project that is cross platform for iOS and Android, and would love to be able to work on it under Linux, but this means I cannot start the player. Understandably I would not be able to compile for iOS, but we have a separate OSX build machine set up to take care of that for us 
Thanks
Try installing Microsoft.AspNet.Web.Optimization via nuget (as it is not installed by the framework).
Try install-package Microsoft.AspNet.Web.Optimization in the nuget prompt.