Warnings fixed

Assets/MediaPipeUnity/Scripts/AbstractFeedback.cs

@@ -47,10 +47,10 @@ public abstract class AbstractFeedback : MonoBehaviour, Listener
     /// </summary>
     protected string previousIncorrectSign = null;
 
-    public void ProcessIncomingCall()
+    public IEnumerator ProcessIncomingCall()
     {
         //UpdateFeedback2();
-        StartCoroutine(UpdateFeedback());
+        yield return StartCoroutine(UpdateFeedback());
     }
 
     public void AddSelfAsListener()

Assets/MediaPipeUnity/Scripts/SignPredictor.cs

@@ -326,7 +326,7 @@ namespace Mediapipe.Unity.Tutorial
                     //Debug.Log($"prob = [{learnableProbabilities.Aggregate("   ", (t, kv) => $"{t}{kv.Key}:{kv.Value}   ")}]");
                     foreach(Listener listener in listeners)
                     {
-                        listener.ProcessIncomingCall();
+                        yield return listener.ProcessIncomingCall();
                     }
                 }
                 else