rolesInfo command raises System.InvalidOperationException : Duplicate element name 'roles'.

            var clientSettings = new MongoClientSettings();

            clientSettings.Server = new MongoServerAddress("localhost", 27340);

            var server = new MongoServer(MongoServerSettings.FromClientSettings(clientSettings));

            server.Connect();

            var db = server.GetDatabase("admin");

            var command = new CommandDocument("rolesInfo", 1);

            db.RunCommand(command);

            server.Disconnect();

  at MongoDB.Bson.BsonDocument.Add(BsonElement element) in BsonDocument.cs: line 424

   at MongoDB.Bson.BsonDocument.Add(String name, BsonValue value) in BsonDocument.cs: line 586

   at MongoDB.Bson.Serialization.Serializers.BsonDocumentSerializer.DeserializeValue(BsonDeserializationContext context, BsonDeserializationArgs args) in BsonDocumentSerializer.cs: line 67

   at MongoDB.Bson.Serialization.Serializers.BsonValueSerializerBase`1.Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args) in BsonValueSerializerBase.cs: line 51

   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Deserialize(IBsonSerializer`1 serializer, BsonDeserializationContext context) in IBsonSerializerExtensions.cs: line 49

   at MongoDB.Driver.CommandResultSerializer`1.Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args) in CommandResultSerializer.cs: line 39

   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Deserialize(IBsonSerializer`1 serializer, BsonDeserializationContext context) in IBsonSerializerExtensions.cs: line 49

   at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.ProcessReply(ConnectionId connectionId, ReplyMessage`1 reply) in CommandWireProtocol.cs: line 206

   at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.Execute(IConnection connection, CancellationToken cancellationToken) in CommandWireProtocol.cs: line 111

   at MongoDB.Driver.Core.Servers.Server.ServerChannel.ExecuteProtocol(IWireProtocol`1 protocol, CancellationToken cancellationToken) in Server.cs: line 698

   at MongoDB.Driver.Core.Servers.Server.ServerChannel.Command(DatabaseNamespace databaseNamespace, BsonDocument command, IElementNameValidator commandValidator, Func`1 responseHandling, Boolean slaveOk, IBsonSerializer`1 resultSerializer, MessageEncoderSettings messageEncoderSettings, CancellationToken cancellationToken) in Server.cs: line 348

   at MongoDB.Driver.Core.Operations.CommandOperationBase`1.ExecuteProtocol(IChannelHandle channel, ServerDescription serverDescription, ReadPreference readPreference, CancellationToken cancellationToken) in CommandOperationBase.cs: line 181

   at MongoDB.Driver.Core.Operations.CommandOperationBase`1.ExecuteProtocol(IChannelSource channelSource, ReadPreference readPreference, CancellationToken cancellationToken) in CommandOperationBase.cs: line 206

   at MongoDB.Driver.Core.Operations.WriteCommandOperation`1.Execute(IWriteBinding binding, CancellationToken cancellationToken) in WriteCommandOperation.cs: line 57

   at MongoDB.Driver.MongoDatabase.ExecuteWriteOperation(IWriteOperation`1 operation) in MongoDatabase.cs: line 966

   at MongoDB.Driver.MongoDatabase.RunCommandAs(IMongoCommand command, IBsonSerializer`1 resultSerializer, ReadPreference readPreference) in MongoDatabase.cs: line 992

   at MongoDB.Driver.MongoDatabase.RunCommandAs(IMongoCommand command, ReadPreference readPreference) in MongoDatabase.cs: line 837

   at MongoDB.Driver.MongoDatabase.RunCommandAs(IMongoCommand command) in MongoDatabase.cs: line 821

   at MongoDB.Driver.MongoDatabase.RunCommand(IMongoCommand command) in MongoDatabase.cs: line 799