avalonia项目在银河麒麟操作系统arm架构上运行报错：Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'typeface')

using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using Avalonia.Media;
using Avalonia.Media.Fonts;
using Avalonia.Platform;
using Avalonia.Skia;
using SkiaSharp;

namespace AvaloniaDemo
{
public class CustomFontManagerImpl : IFontManagerImpl
{
private readonly Typeface[] _customTypefaces;
private readonly string _defaultFamilyName;

//Load font resources in the project, you can load multiple font resources
private readonly Typeface _defaultTypeface =
new Typeface("resm:AvaloniaDemo.Assets.Fonts.msyh#微软雅黑");

public CustomFontManagerImpl()
{
_customTypefaces = new[] { _defaultTypeface };
_defaultFamilyName = _defaultTypeface.FontFamily.FamilyNames.PrimaryFamilyName;
}

public string GetDefaultFontFamilyName()
{
return _defaultFamilyName;
}

public IEnumerable<string> GetInstalledFontFamilyNames(bool checkForUpdates = false)
{
return _customTypefaces.Select(x => x.FontFamily.Name);
}

private readonly string[] _bcp47 = { CultureInfo.CurrentCulture.ThreeLetterISOLanguageName, CultureInfo.CurrentCulture.TwoLetterISOLanguageName };

public bool TryMatchCharacter(int codepoint, FontStyle fontStyle, FontWeight fontWeight, FontFamily fontFamily,
CultureInfo culture, out Typeface typeface)
{
foreach (var customTypeface in _customTypefaces)
{
if (customTypeface.GlyphTypeface.GetGlyph((uint)codepoint) == 0)
{
continue;
}

typeface = new Typeface(customTypeface.FontFamily.Name, fontStyle, fontWeight);

return true;
}

var fallback = SKFontManager.Default.MatchCharacter(fontFamily?.Name, (SKFontStyleWeight)fontWeight,
SKFontStyleWidth.Normal, (SKFontStyleSlant)fontStyle, _bcp47, codepoint);

typeface = new Typeface(fallback?.FamilyName ?? _defaultFamilyName, fontStyle, fontWeight);

return true;
}

public IGlyphTypefaceImpl CreateGlyphTypeface(Typeface typeface)
{
SKTypeface skTypeface;

switch (typeface.FontFamily.Name)
{
case FontFamily.DefaultFontFamilyName:
case "微软雅黑": //font family name
skTypeface = SKTypeface.FromFamilyName(_defaultTypeface.FontFamily.Name); break;
default:
skTypeface = SKTypeface.FromFamilyName(typeface.FontFamily.Name,
(SKFontStyleWeight)typeface.Weight, SKFontStyleWidth.Normal, (SKFontStyleSlant)typeface.Style);
break;
}


//解决linux系统下skTypeface是null
if (skTypeface == null) 80 { 81 skTypeface = SKTypeface.FromFamilyName(_defaultTypeface.FontFamily.Name); 82 } 83 
//如果是centos7之类的使用linux里面的字体
if (skTypeface == null) 86 { 87 skTypeface = SKTypeface.FromFamilyName("WenQuanYi Micro Hei"); 88 } 89 
return new GlyphTypefaceImpl(skTypeface);
}

}
}

PS:重点参考标红部分