Binding Objective-C

I'm trying to write a wrapper for SWRevealViewController. Here's a link to the source https://github.com/John-Lluch/SWRevealViewController

I use Objective Sharpie. Successfully create a C # file, but compile with error. Error CS0246: The type or namespace name 'FrontViewPosition' could not be found. Are you missing an assembly reference?

'FrontViewPosition' is enum and is present in C# file. How to solve this problem?