Добавьте файлы проекта.

YandexMusic.API/Models/Ynison/YYnisonPlayerStateStatus.cs

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+namespace YandexMusic.API.Models.Ynison
+{
+    public class YYnisonPlayerStateStatus
+    {
+        public decimal DurationMs { get; set; }
+        public bool Paused { get; set; } = true;
+        public decimal PlaybackSpeed { get; set; } = 1;
+        public decimal ProgressMs { get; set; }
+        public YYnisonVersion Version { get; set; }
+    }
+}