Anyone arriving here with the same issue as user2933990. Below is the correct fix if you added the source code OAuthTwitterWrapper (and compiled) instead of the dll itself.
In the JsonTypes directory, modify the following files:
User.cs
Original
[JsonProperty("id")]
public int Id { get; set; }
Change to
[JsonProperty("id")]
public long Id { get; set; }
Hashtag.cs
Original
[JsonProperty("indices")]
public List<int> Indices { get; set; }
Change to
[JsonProperty("indices")]
public List<long> Indices { get; set; }
source
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