Error in the public class FileEventStream In the Analytics.CSharp version 2.3.2 source code: In the eventoutputstream, line 204 _fs = _file.Open(FileMode.Append); should be _fs = _file.Open(FileMode.Append, FileAccess.Write); As FileMode.Append will throw an error withot the FileAcces.Write. Please see the intellisense: 