Add error handling for wrong urls

app.py

@@ -25,7 +25,10 @@ def image_to_sam_image_embedding(
 
     image_url = urllib.parse.unquote(image_url)
 
-    image = download_image(image_url)
+    try:
+        image = download_image(image_url)
+    except:
+        raise gr.Error(f"Could not find image with URL {image_url}")
     image = image.convert("RGB")
     image = np.asarray(image)