[fix error]

app.py

@@ -26,7 +26,7 @@ if not os.path.exists(expected_model_path):
 
 def reflection_removal(input_image):
     if not input_image.lower().endswith((".jpg", ".jpeg", ".png")):
-        return "File is not supported (only .jpg, .jpeg, .png)."
+        return ["File is not supported (only .jpg, .jpeg, .png)."]
     
     file_path = os.path.join(UPLOAD_DIR, os.path.basename(input_image))
     shutil.copy(input_image, file_path)
@@ -47,9 +47,10 @@ def reflection_removal(input_image):
         for file in files:
             if file.endswith("_fake.png"):
                 result_path = os.path.join(root, file)
-                return Image.open(result_path)
+                return [Image.open(result_path)]
+
+    return ["No results found."]
 
-    return "No results found."
 
 def use_sample_image(sample_image_name):
     sample_image_path = os.path.join(SAMPLE_DIR, sample_image_name)