<PackageReference Include="NETStandard.Library" Version="2.0.3" />

System.Text.DecoderFallbackException

namespace System.Text { public sealed class DecoderFallbackException : ArgumentException { public byte[] BytesUnknown { get; } public int Index { get; } public DecoderFallbackException(); public DecoderFallbackException(string message); public DecoderFallbackException(string message, byte[] bytesUnknown, int index); public DecoderFallbackException(string message, Exception innerException); } }