Python Telegram Bot Api shows error Message text is empty how to debug

i there i'am doing a medical chatbot project using telegram bot api and Apimedic Api when i

/start

first bot reply(which asks for language selection) works fine after that it as to return to ask Gender after that Age and so on

def start(bot, update):
    reply_keyboard = [["English", "हिंदी"], ["मराठी", "বাংলা"]]
    lang_pick = "Please select your language.\nअपना भाषा चुनें।\nकृपया तुमची भाषा निवडा\nআপনার ভাষা নির্বাচন করুন"
    update.message.reply_text(lang_pick,
        reply_markup=ReplyKeyboardMarkup(reply_keyboard, one_time_keyboard=True))

    return LANGUAGE

def language(bot, update, user_data):
    reply_keyboard = [['Male', 'Female'], ['Other']]
    user = update.message.from_user
    text = update.message.text
    user_data["lang"] = lang_map[text]
    welcome_text = "Hi {}! I will help you with your medical conditions.\nSend /cancel to stop talking to me.\n\nPlease select your Gender.".format(user.first_name)
    update.message.reply_text(translate_from_english(welcome_text, user_data["lang"]),
        reply_markup=ReplyKeyboardMarkup(reply_keyboard, one_time_keyboard=True))

    return GENDER

def gender(bot, update, user_data):
    user = update.message.from_user
    text = update.message.text
    user_data["gender"] = text
    logger.info("Gender of %s: %s", user.first_name, update.message.text)
    reply = 'I see! Please tell me about your Age, so I can detect disease easily.'
    update.message.reply_text(translate_from_english(reply, user_data["lang"]), reply_markup=ReplyKeyboardRemove())

    return AGE

but instead it shows this error.

Starting..!
    2021-02-10 07:47:08,728 - __main__ - INFO - Waking Up Bot.
    2021-02-10 07:47:08,730 - __main__ - INFO - Bot is polling for sessions.
    2021-02-10 07:47:55,224 - telegram.ext.dispatcher - WARNING - A TelegramError was raised while processing the Update
    2021-02-10 07:47:55,225 - __main__ - WARNING - Update "{'update_id': 472297741,
    'message': {'message_id': 3, 'date': 1612923477, 'chat': {'id': 1680986729, 'typ
    e': 'private', 'first_name': 'Gopi'}, 'text': 'English', 'entities': [], 'captio
    n_entities': [], 'photo': [], 'new_chat_members': [], 'new_chat_photo': [], 'del
    ete_chat_photo': False, 'group_chat_created': False, 'supergroup_chat_created':
    False, 'channel_chat_created': False, 'from': {'id': 1680986729, 'first_name': '
    Gopi', 'is_bot': False, 'language_code': 'en'}}, '_effective_user': {'id': 16809
    86729, 'first_name': 'Gopi', 'is_bot': False, 'language_code': 'en'}, '_effectiv
    e_chat': {'id': 1680986729, 'type': 'private', 'first_name': 'Gopi'}, '_effectiv
    e_message': {'message_id': 3, 'date': 1612923477, 'chat': {'id': 1680986729, 'ty
    pe': 'private', 'first_name': 'Gopi'}, 'text': 'English', 'entities': [], 'capti
    on_entities': [], 'photo': [], 'new_chat_members': [], 'new_chat_photo': [], 'de
    lete_chat_photo': False, 'group_chat_created': False, 'supergroup_chat_created':
     False, 'channel_chat_created': False, 'from': {'id': 1680986729, 'first_name':
    'Gopi', 'is_bot': False, 'language_code': 'en'}}}" caused error "Message text is empty"

i'am using python-telegram-bot 11.0.0 which is suitable for my python code. here is that code sample

from telegram import (ReplyKeyboardMarkup, ReplyKeyboardRemove)
from telegram.ext import (Updater, CommandHandler, MessageHandler, Filters, RegexHandler,
                          ConversationHandler)

this is my handler the token is just example not actual

def main():
    # Create the EventHandler and pass it your bot's token.
    print('Starting..!')
    logger.info("Waking Up Bot.")
    updater = Updater("2483457814:AAHrlCx234_VskzWEJdWjTsdfuwejHyu5mI")

    # Get the dispatcher to register handlers
    dp = updater.dispatcher

    # Add conversation handler with the states GENDER, PHOTO, LOCATION and BIO
    conv_handler = ConversationHandler(
        entry_points=[CommandHandler('start', start)],

        states={
            LANGUAGE: [RegexHandler('^(English)$', language, pass_user_data=True)],

            GENDER: [RegexHandler('^(Male|Female|Other)$', gender, pass_user_data=True)],

            AGE: [RegexHandler('^[1-9][0-9]{0,1}$', age, pass_user_data=True),
                    CommandHandler('skip', skip_age, pass_user_data=True)],

            LOCATION: [MessageHandler(Filters.location, location, pass_user_data=True),
                       CommandHandler('skip', skip_location, pass_user_data=True)],

            BIO: [MessageHandler(Filters.text, bio, pass_user_data=True)]
        },

        fallbacks=[CommandHandler('cancel', cancel)]
    )

    dp.add_handler(conv_handler)

    # log all errors
    dp.add_error_handler(error)

    # Start the Bot
    logger.info("Bot is polling for sessions.")
    updater.start_polling()

    updater.idle()