Extending Cakedc/users

After extending the plugin like describe in the doc: https://github.com/CakeDC/users/blob/master/Docs/Documentation/Extending-the-Plugin.md
If I go to register new users I obtain an error: Call to undefined method Cake\ORM\Entity::updateToken()
it appears on the behaviors when i debug entity (debug($user);), I get: something like:
object(Cake\ORM\Entity) {
‘username’ => ‘admin’,
‘email’ => ‘admin@admin.com’,
‘password’ => ‘admin’,
‘password_confirm’ => ‘admin’,
‘first_name’ => ‘admin’,
‘last_name’ => ‘admin’,
‘tos’ => ‘0’,
‘role’ => ‘user’,
‘validated’ => false,
‘active’ => false,
‘[new]’ => true,
‘[accessible]’ => [
‘*’ => true
],
‘[dirty]’ => [
‘username’ => true,
‘email’ => true,
‘password’ => true,
‘password_confirm’ => true,
‘first_name’ => true,
‘last_name’ => true,
‘tos’ => true,
‘role’ => true,
‘validated’ => true,
‘active’ => true
],
‘[original]’ => [],
‘[virtual]’ => [],
‘[hasErrors]’ => false,
‘[errors]’ => [],
‘[invalid]’ => [],
‘[repository]’ => ‘IcUsers’

}
the same debug without extending the plugin I get:
object(CakeDC\Users\Model\Entity\User) {
‘username’ => ‘admin’,
‘email’ => ‘admin@admin.com’,
‘password’ => ‘$2y$10$EqOyuxh/Ck6WHR7k6TGBg.igjeuUQDGJR7LFaXfszl.OkyhScUhC6’,
‘password_confirm’ => ‘admin’,
‘first_name’ => ‘admin’,
‘last_name’ => ‘admin’,
‘tos_date’ => object(Cake\I18n\Time) {

	'time' => '2019-06-22T23:42:24+00:00',
	'timezone' => 'UTC',
	'fixedNowTime' => false

},
'tos' => '1',
'role' => 'user',
'validated' => false,
'active' => false,
'[new]' => true,
'[accessible]' => [
	'*' => true,
	'id' => false,
	'is_superuser' => false,
	'role' => false
],
'[dirty]' => [
	'username' => true,
	'email' => true,
	'password' => true,
	'password_confirm' => true,
	'first_name' => true,
	'last_name' => true,
	'tos' => true,
	'tos_date' => true,
	'role' => true,
	'validated' => true,
	'active' => true
],
'[original]' => [],
'[virtual]' => [],
'[hasErrors]' => false,
'[errors]' => [],
'[invalid]' => [],
'[repository]' => 'CakeDC/Users.Users'

}
It seems the behavior are not linked to the users entity after extending it, but dont know how to correct this.
Thansk for your help.

Please check the configuration was loaded correctly, and you have set the Users.table key to your new one.

Thank you for your fast reply steinkel, after your answer, I have rechecked once more and you are right, I have done something wrong, I have create the file extending entity with plural name instead of singular.
Sorry for the noob error!