fix bug

app.py

@@ -194,7 +194,7 @@ def single_tab_iit():
         inputs=[head_image, head_ent, tail_image, tail_ent, question_text, question_ent], 
         outputs=[output_text])
         
-    examples=[['examples/tree.jpg', 'Q10884', 'examples/forest.png', 'Q4421', "Anhui", 'Q40956']]
+    examples=[['examples/tree.jpg', 'Q10884', 'examples/forest.jpg', 'Q4421', "Anhui", 'Q40956']]
     ex = gr.Examples(
         examples=examples, 
         fn=single_inference_iit,