sharpcompress: NotSupportedException for 7zip Archive using Ultra Compression

I zipped up a file using 7zip (file manager / GUI). I tried with both LZMA and LZMA2, using ultra compression. I can’t seem to figure out how to extract it; I always get a NotSupportedException.

Here are the two snippets I tried with the archiving API, which supposedly works?

                // 1) Archive API? not supported exception.
                var archive = ArchiveFactory.Open(archivePath);
                archive.WriteToDirectory(outPath, options);

                // 2) Archive API: not supported exception
                var archive = ArchiveFactory.Open(archivePath);
                foreach (var entry in archive.Entries.Where(e => !e.IsDirectory))
                {
                    entry.WriteToDirectory(outPath, options);
                }

I think they fail with the same exception. Here’s the stack trace for the second one:

Exception has occurred: CLR/System.NotSupportedException
An unhandled exception of type 'System.NotSupportedException' occurred in SharpCompress.dll: 'Specified method is not supported.'
   at SharpCompress.Compressors.LZMA.DecoderRegistry.CreateDecoderStream(CMethodId id, Stream[] inStreams, Byte[] info, IPasswordProvider pass, Int64 limit)
   at SharpCompress.Compressors.LZMA.DecoderStreamHelper.CreateDecoderStream(Stream inStream, Int64 startPos, Int64[] packSizes, CFolder folderInfo, IPasswordProvider pass)
   at SharpCompress.Common.SevenZip.ArchiveDatabase.GetFolderStream(Stream stream, CFolder folder, IPasswordProvider pw)
   at SharpCompress.Common.SevenZip.SevenZipFilePart.GetCompressedStream()
   at SharpCompress.Archives.SevenZip.SevenZipArchiveEntry.OpenEntryStream()
   at SharpCompress.Archives.IArchiveEntryExtensions.WriteTo(IArchiveEntry archiveEntry, Stream streamToWriteTo)
   at SharpCompress.Archives.IArchiveEntryExtensions.<>c__DisplayClass2_0.<WriteToFile>b__0(String x, FileMode fm)
   at SharpCompress.Common.ExtractionMethods.WriteEntryToFile(IEntry entry, String destinationFileName, ExtractionOptions options, Action`2 openAndWrite)
   at SharpCompress.Archives.IArchiveEntryExtensions.WriteToFile(IArchiveEntry entry, String destinationFileName, ExtractionOptions options)
   at SharpCompress.Common.ExtractionMethods.WriteEntryToDirectory(IEntry entry, String destinationDirectory, ExtractionOptions options, Action`2 write)
   at SharpCompress.Archives.IArchiveEntryExtensions.WriteToDirectory(IArchiveEntry entry, String destinationDirectory, ExtractionOptions options)

I’m sure it must be something I’m doing wrong (perhaps in my 7zip archive creation?) but I can’t figure out what or how to make this work.