try

app.py

@@ -95,6 +95,10 @@ def load_llm_model():
 # Step 3: Text-to-Speech with gTTS (Google Text-to-Speech)
 def gtts_text_to_speech(text):
     """Convert text to speech using gTTS and ensure proper WAV format."""
+    # Import numpy and wavfile at the function level to ensure they're available in all code paths
+    import numpy as np
+    from scipy.io import wavfile
+    
     # Create absolute paths for temporary files
     temp_dir = tempfile.gettempdir()
     mp3_filename = os.path.join(temp_dir, f"tts_temp_{os.getpid()}_{time.time()}.mp3")
@@ -154,12 +158,9 @@ def gtts_text_to_speech(text):
             except Exception as e:
                 print(f"pydub conversion failed: {str(e)}")
         
-        # Method 3: Direct WAV creation with gTTS-like library (last resort)
+        # Method 3: Direct WAV creation
         if not wav_created:
             try:
-                import numpy as np
-                from scipy.io import wavfile
-                
                 print("Generating synthetic speech directly...")
                 # Generate a simple speech-like tone pattern
                 sample_rate = 24000