my account page

I did changes in function.php. It was add track order to side menu in account page and also it was added icon to dashboard at account page. But now i see some mistake:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘bbloomer_add_track_order_endpoint’ not found or invalid function name in /var/www/vhosts/u0420265.plsk.regruhosting.ru/httpdocs/orangeblack.store/wp-includes/class-wp-hook.php on line 286
Do you know what i can do?
And also i cant add some content to this tag. I think i need shortcode of track order.
I have this code for content:
// ——————
// 4. Add content to the new endpoint

function bbloomer_track_order_content() {
echo ‘<h3>Отслеживание доставки заказа</h3><p>Для отслеживания вашего заказа, пожалуйста, введите номер вашего заказа в поле ниже и нажмите кнопку “Отслеживание”. Вы найдёте его в квитанции, которая была отправлена вам по электронной почте.<i>Please contact your theme/plugin developer for theme/plugin-related support.</i></p>’;
echo do_shortcode( ‘ /* your shortcode here */ ‘ );
}

add_action( ‘woocommerce_account_track-order_endpoint’, ‘bbloomer_track_order_content’ );

Is it right or no?

I see this on the top of page.
Can you help me to complete this content part? I dont know how i can put shortcode of track order there.

hello. thanks i fixed it with plugin. but now i dont know how i can fix scripts of website which push the server. i changed plan and now my hosting so expensive for my small store. can you help me to understand how i can fix it?

i sent it before. ok no problem. now i pay 20 dollar per mont for hosting for store with 90 items. so funny. but i am not professional and i dont know this shit like scripts.
Other one what i have. Look at pics. Do you have some idea what it can be? Its checkout step.

Thanks a lot. Yes its not by your theme.