Use a third part model

I,sorry for english, to manage user i use the extension yii2-user , the path is app\vendor\dektrium\yii2-user;

if i want use this , in the controller i write :

use app\vendor\dektrium\yii2-user\models\User;

But i have this errors :

syntax error, unexpected '-', expecting ',' or ';'

how must i insert the model in the controller without ‘-’ ?