Update app.py

app.py

@@ -58,7 +58,7 @@ def infer(question, history):
     
     chat_history = res
     query = question
-    result = qa({"question": query, "chat_history": chat_history, "system:": "This is a world-class summarizing AI, be helpful."})
+    result = qa({"question": query, "chat_history": chat_history, "system:":"This is a world-class summarizing AI, be helpful."})
     return result["answer"]
 
 def auto_clear_data():