In .net6, an exception occurs when converting to other formats

[dodu2014]

How to solve this problem？

  [ApiController]
  public class PsdController : BaseController
  {
    public PsdController(IWebHostEnvironment env) : base(env) {
    }

    [HttpGet("export")]
    public IActionResult Export() {

      var dir = env.WebRootPath;
      using var ms = new MemoryStream();
      using var pfile = Aspose.PSD.Image.Load(dir + "/images/MerchantQrcodeBoard.psd");

      // save result in different raster formats with customized attributes
      pfile.Save(dir + "/images/output.png", new Aspose.PSD.ImageOptions.PngOptions());
      pfile.Save(dir + "/images/output.jpg", new Aspose.PSD.ImageOptions.JpegOptions() { Quality = 70 });
      pfile.Save(dir + "/images/output.tiff", new Aspose.PSD.ImageOptions.TiffOptions(Aspose.PSD.FileFormats.Tiff.Enums.TiffExpectedFormat.TiffCcitRle));

      pfile.Save(ms, new Aspose.PSD.ImageOptions.PngOptions());

      return File(ms.ToArray(), "image/png");
    }

  }