Update app.py

app.py

@@ -441,7 +441,7 @@ def invoke (prompt, file, history, rag_option, model_option, openai_api_key, k=3
         buffer = io.BytesIO()
         image.save(buffer, format='PNG')
         desiredObject = buffer.getbuffer()
-        buffer.close()
+        
         print("image:.................")
         print(desiredObject)
         history[-1][1] =  desiredObject  #file.name,