Update app.py

app.py

@@ -95,6 +95,10 @@ def predict_hemoglobin(age, gender, image):
         if image is None:
             return "Error: No image uploaded. Please upload an image."
 
+        # Check if the image is valid
+        if not isinstance(image, Image.Image):
+            return "Error: Invalid image format. Please upload a valid image file."
+
         # Extract features from the image
         features = extract_features(image)