Update app.py

app.py

@@ -5,7 +5,7 @@ from google.generativeai.types import HarmCategory, HarmBlockThreshold
 import gradio as gr
 import re
 
-global system_instruction, model, chat_session
+
 
 # Configure the Gemini API
 genai.configure(api_key=os.environ["GEMINI_API_KEY"])
@@ -62,6 +62,7 @@ def introduce_typos(text, typo_probability=0.03):
 def generate_text(system_instruction, prompt):
 
     if prompt.lower() == "refresh()":
+        global chat_session
         chat_session = model.start_chat(history=[])
         return "Umm"