specify str variable for histories on transcibe function

app.py

@@ -53,7 +53,7 @@ def generate(user_prompt, temperature=0.1, max_new_tokens=128, top_p=0.95, repet
 
 
 @spaces.GPU(duration=60)
-def transcribe(audio, formatted_history, instruct_history):
+def transcribe(audio, formatted_history="""""", instruct_history = """"""):
 
     sr, y = audio
     y = y.astype(np.float32)