update clearall()

app.py

@@ -1347,8 +1347,9 @@ def clearall():
     # memory_openai.clear()
     global Filename_Chatbot
     Filename_Chatbot = []
-    with open("output.log", "w") as file:
-        file.truncate(0)
+    file_path = "output.log"
+    if os.path.isfile(file_path):
+        os.remove(file_path)
     return [[], gr.update(visible=True), gr.update(visible=False), []]
 
 def retry(history3):