Module development and code questions

Hii, I'm surfing my website and then I´ve deleted a module called Sports League and a error message appears and I can´t dot nothing.

The following message appears:

Hello!

It was necessary to create a module that writes Drupal logs using cron and sends them to mail using hook_mail and (or) do_mail. Module created and included, did I do it right and how to see the result. I enclose the code ... THANKS!

cron_log_mail.yml name: 'cron log mail' description: 'simple cron log mail' package: modules_custom type: module core_version_requirement: ^ 8.8 || ^ 9 cron_log_mail.php

Type	php
Date	Vendredi, 21 août, 2020 - 16:22
Utilisateur	Anonyme (non vérifié)
Emplacement	https://www.example.com/fr
Référent	
Message	User warning : The following theme is missing from the file system: message_activity_stream dans drupal_get_filename() (/var/www/www-example-com/web/core/includes/bootstrap.inc ligne 295)
#0 /var/www/www-example-com/web/core/includes/bootstrap.inc(600): _drupal_error_handler_real(512, 'The following t...', '/var/www/www-s1...', 295, Array)

I`m using Bootstrap 4 theme and I have some users with diferents roles. I´ve used a dropdown menu of bootstrap and it only works when I sign in with admin account. 

With another account the following message appears in the console of my browser :

Uncaught TypeError: Bootstrap's dropdowns require Popper.js.

I don´t know what happen, if this is due to the user permissions or what.

Hi, almost every time I delete a field in my product types I get this message popping up in my dashboard :

<blockquote>ENTITY/FIELD DEFINITIONS
Mismatched entity and/or field definitions
The following changes were detected in the entity type and field definitions.
Product
The commerce_product.field_produit_labels field needs to be updated.</blockquote>

It has not been possible to update entities with "Drush" for some time.

Why do I have these problems regularly ? This is only with the Commerce module.

I have a field in form like this:

$form['equipo_local'] = array(
      '#type' => 'details',
      '#title' => $this
        ->t('<b>Equipo local</b>'),
      '#group' => 'information',
      '#open' => TRUE,

    );

    $form['equipo_local']['seleccion_local'] = array(
      '#type' => 'select',
      '#title' => t('<b> Equipo :</b>'),
      '#validated' => TRUE,
      '#required' => TRUE,
      '#options' => $this->dicc,


    );

Being $this->dicc a mutiple select list :