LitJSON.ParserToken inaccessable due to its protection level

I imported all of the LitJSON/src files and I got this error LitJSON.ParserToken inaccessable due to its protection level. Is there anyway to fix this?

I suggest that you use MiniJSON instead, which gives you the complete source code and also works on iOS/Android seamlessly:

https://github.com/prime31/UIToolkit/blob/master/Assets/Plugins/MiniJSON.cs