Is this possible?
To use umbraco api through winforms?
I try to do this:

var dt = new DocumentType(1244);
var u = new User(0);
var parentId = 1146;
var d = Document.MakeNew("test through winforms", dt, u, parentId);

But when it comes to "Document.MakeNew" it throws me that error:

Message:Object reference not set to an instance of an object.

at Umbraco.Core.Configuration.UmbracoSettings.GetKey(String key)
at Umbraco.Core.Configuration.UmbracoSettings.get_EnableLogging()
at umbraco.UmbracoSettings.get_EnableLogging()
at umbraco.BusinessLogic.Log.Add(LogTypes type, User user, Int32 nodeId, String comment)
at umbraco.cms.businesslogic.web.Document.MakeNew(String Name, DocumentType dct, User u, Int32 ParentId)

Does anyone have any idea what i'm doing wrong?
And is it possible? 
If possible, can someone give me an working example?

I'm using dlls of version 4.9.1