Post into wordpress blog via C# & WordPressSharp

[admin]

I'm using WordPressSharp and trying to add content into my wordpress blog.
I'm having trouble with adding content.

Helper.WordpressConfigurations.postToWordpress(1, "testing", "content description");

Here is my post method

public static Post setPost(int postType, string title, string content)
    {
      string type = postType == 1 ? "post" : "page";
      int categoryId = 0;
      switch ("".ToLowerInvariant())
      {
        case "arrow": categoryId = 4; break;
        default: categoryId = 0; break;
      }
      return new Post
      {
        PostType = "post", // "post" or "page"
        Title = title,
        Content = content,
        PublishDateTime = DateTime.Now,
        Status = "publish"//, // "draft" or "publish",
        //Terms = terms
      };
    }

Having exception in WordpressClient.cs >
<img src="

https://imgur.com/Cof1a

" alt="enter image description here" />
my full code here <a href="http://paste.ubuntu.com/10793675/" rel="nofollow noreferrer">http://paste.ubuntu.com/10793675/</a>