Exception when transforming bitmap into DicomFile

I am trying to transform a bitmap object into a DicomFile object with version 3.0.2.0 of fo-dicom (which I got through NuGet). However, when I run the code below (which I found here), I don't even get past properly initializing the DicomDataset.

using Dicom;
using Dicom.Imaging;
using Dicom.IO.Buffer;
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Text;

namespace DICOM
{
    class BitmapToDICOM
    {
        public static DicomFile TransformBitmapToDICOM(Bitmap bitmap)
        {
            bitmap = GetValidImage(bitmap);
            int rows, columns;
            byte[] pixels = GetPixels(bitmap, out rows, out columns);
            MemoryByteBuffer buffer = new MemoryByteBuffer(pixels);
            DicomDataset dataset = new DicomDataset();

            dataset.Add(DicomTag.BitsAllocated, (ushort)8);

            // Prepare the dataset
            FillDataset(dataset);
            dataset.Add(DicomTag.PhotometricInterpretation, PhotometricInterpretation.Rgb.Value);
            dataset.Add(DicomTag.Rows, (ushort)rows);
            dataset.Add(DicomTag.Columns, (ushort)columns);
            DicomPixelData pixelData = DicomPixelData.Create(dataset, true);
            pixelData.BitsStored = 8;
            pixelData.BitsAllocated = 8;
            pixelData.SamplesPerPixel = 3;
            pixelData.HighBit = 7;
            pixelData.PixelRepresentation = 0;
            pixelData.PlanarConfiguration = 0;
            pixelData.AddFrame(buffer);

            return new DicomFile(dataset);
        }

        private static void FillDataset(DicomDataset dataset)
        {
            //type 1 attributes.
            dataset.Add(DicomTag.SOPClassUID, DicomUID.SecondaryCaptureImageStorage);
            dataset.Add(DicomTag.StudyInstanceUID, GenerateUid());
            dataset.Add(DicomTag.SeriesInstanceUID, GenerateUid());
            dataset.Add(DicomTag.SOPInstanceUID, GenerateUid());

            //type 2 attributes
            dataset.Add(DicomTag.PatientID, "12345");
            dataset.Add(DicomTag.PatientName, string.Empty);
            dataset.Add(DicomTag.PatientBirthDate, "00000000");
            dataset.Add(DicomTag.PatientSex, "M");
            dataset.Add(DicomTag.StudyDate, DateTime.Now);
            dataset.Add(DicomTag.StudyTime, DateTime.Now);
            dataset.Add(DicomTag.AccessionNumber, string.Empty);
            dataset.Add(DicomTag.ReferringPhysicianName, string.Empty);
            dataset.Add(DicomTag.StudyID, "1");
            dataset.Add(DicomTag.SeriesNumber, "1");
            dataset.Add(DicomTag.ModalitiesInStudy, "CR");
            dataset.Add(DicomTag.Modality, "CR");
            dataset.Add(DicomTag.NumberOfStudyRelatedInstances, "1");
            dataset.Add(DicomTag.NumberOfStudyRelatedSeries, "1");
            dataset.Add(DicomTag.NumberOfSeriesRelatedInstances, "1");
            dataset.Add(DicomTag.PatientOrientation, "F/A");
            dataset.Add(DicomTag.ImageLaterality, "U");
        }

        private static DicomUID GenerateUid()
        {
            StringBuilder uid = new StringBuilder();
            uid.Append("1.08.1982.10121984.2.0.07").Append('.').Append(DateTime.UtcNow.Ticks);
            return new DicomUID(uid.ToString(), "SOP Instance UID", DicomUidType.SOPInstance);
        }

        private static Bitmap GetValidImage(Bitmap bitmap)
        {
            if (bitmap.PixelFormat != PixelFormat.Format24bppRgb)
            {
                Bitmap old = bitmap;
                using (old)
                {
                    bitmap = new Bitmap(old.Width, old.Height, PixelFormat.Format24bppRgb);
                    using (Graphics g = Graphics.FromImage(bitmap))
                    {
                        g.DrawImage(old, 0, 0, old.Width, old.Height);
                    }
                }
            }
            return bitmap;
        }
        private static byte[] GetPixels(Bitmap image, out int rows, out int columns)
        {
            rows = image.Height;
            columns = image.Width;

            if (rows % 2 != 0 && columns % 2 != 0)
                --columns;

            BitmapData data = image.LockBits(new Rectangle(0, 0, columns, rows), ImageLockMode.ReadOnly, image.PixelFormat);
            IntPtr bmpData = data.Scan0;
            try
            {
                int stride = columns * 3;
                int size = rows * stride;
                byte[] pixelData = new byte[size];
                for (int i = 0; i < rows; ++i)
                    Marshal.Copy(new IntPtr(bmpData.ToInt64() + i * data.Stride), pixelData, i * stride, stride);

                //swap BGR to RGB
                SwapRedBlue(pixelData);
                return pixelData;
            }
            finally
            {
                image.UnlockBits(data);
            }
        }
        private static void SwapRedBlue(byte[] pixels)
        {
            for (int i = 0; i < pixels.Length; i += 3)
            {
                byte temp = pixels[i];
                pixels[i] = pixels[i + 2];
                pixels[i + 2] = temp;
            }
        }
    }
}

When it reaches the "dataset.Add(DicomTag.StudyInstanceUID, GenerateUid());" part of the code I get a "System.TypeInitializationException" with a full stack trace of

System.TypeInitializationException occurred
  HResult=0x80131534
  Message=Typeinitialiseringsfunktionen for 'Dicom.DicomEncoding' triggered an exception.
  Source=Dicom.Core
  StackTrace:
   at Dicom.DicomMultiStringElement..ctor(DicomTag tag, String[] values)
   at Dicom.DicomUniqueIdentifier..ctor(DicomTag tag, DicomUID[] values)
   at Dicom.DicomDataset.DoAdd[T](DicomVR vr, DicomTag tag, IList`1 values, Boolean allowUpdate)
   at Dicom.DicomDataset.DoAdd[T](DicomTag tag, IList`1 values, Boolean allowUpdate)
   at Dicom.DicomDataset.Add[T](DicomTag tag, T[] values)
   at DICOM.BitmapToDICOM.FillDataset(DicomDataset dataset) in [...]\Documents\Visual Studio 2015\Projects\DICOM\DICOM\BitmapToDICOM.cs:line 44
   at DICOM.BitmapToDICOM.TransformBitmapToDICOM(Bitmap bitmap) in [...]\Documents\Visual Studio 2015\Projects\DICOM\DICOM\BitmapToDICOM.cs:line 25
   at DICOM.Program.Main(String[] args) in [...]\Documents\Visual Studio 2015\Projects\DICOM\DICOM\Program.cs:line 18

Inner Exception 1:
NullReferenceException: The object reference is not set to an instance of an object.

What am I doing wrong?

If there are better ways of turning a bitmap into a DicomFile in fo-dicom I am all ears.