fix operand error in app.py

app.py

@@ -45,7 +45,7 @@ article = "How to Use: Upload a food image in the upload section above or select
           "Click on the 'Submit' button and the model will detect which" \
           "food catagory the image belongs to."
 
-example_list = [["examples" / example] for example in os.listdir("examples")]
+example_list = [["examples/" + example] for example in os.listdir("examples")]
 
 food101_app = gr.Interface(fn=predict,
                             inputs=gr.Image(type="pil"),