idk looking waht to fix for runtime error

app.py

@@ -50,7 +50,7 @@ def convert_text_to_speech(parrafo, model):
     if model_info:
         model_path = model_info.get("model_path")
         parrafo_filtrado = filter_text(parrafo)
-        random_name = ''.join(random.choices(string.ascii_letters + string.digits, k=8)) + '.wav'
+        random_name = ''.join(random.choices(str(string.ascii_letters) + str(string.digits), k=8)) + '.wav'
         output_file = os.path.join(file_folder, random_name)
         app.logger.info("Audio file created at: %s", output_file)
         piper_exe = os.path.join(file_folder, 'piper')  # Adjusted the path for piper