Update app.py

app.py

@@ -117,7 +117,7 @@ elif option == "View Previous Conversations":
 # View data summary
 elif option == "View Data Summary":
     if os.path.exists(summary_file):
-        with open(summary_file, "r") as file:
+        with open(summary_file, "r", encoding="utf-8", errors="replace") as file:
             st.text_area("Data Summary", file.read(), height=300)
     else:
         st.warning("No data summary found.")