error after installing simplechat and twig in yii2

[madeeloc]

Twig\Error\RuntimeError
An exception has been thrown during the rendering of a template ("Failed to instantiate component or class "yii\bootstrap\BootstrapAsset".").
↵
Caused by: Invalid Configuration – yii\base\InvalidConfigException
Failed to instantiate component or class "yii\bootstrap\BootstrapAsset".
in /var/www/html/hrhotlist/vendor/yiisoft/yii2/di/Container.php at line 449

↵
Caused by: ReflectionException
Class yii\bootstrap\BootstrapAsset does not exist
in /var/www/html/hrhotlist/vendor/yiisoft/yii2/di/Container.php at line 447

Can someone tell me about this error
I am installing the module simple chat and also installed the twig in yii2 app
but when i hit url basepath/message then above error show

Please help out of this error

[warednsour]

i think the problem is in the config\web.php
please make sure in the very first paramets that you have pasted this
$config = [ 'id' => 'basic', 'basePath' => dirname(__DIR__), 'bootstrap' => ['simplechat'], 'aliases' => [ '@bower' => '@vendor/bower-asset', '@npm' => '@vendor/npm-asset', ], 'components' => [ 'request' => [

[madeeloc]

hello @warednsour ,

After doing that one now i found the below error

Twig\Error\RuntimeError
An exception has been thrown during the rendering of a template ("call_user_func_array() expects parameter 1 to be a valid callback, class 'NavBar' not found").
↵
Caused by: yii\base\ErrorException
call_user_func_array() expects parameter 1 to be a valid callback, class 'NavBar' not found
in /var/www/html/hrhotlist/vendor/yiisoft/yii2-twig/src/Extension.php at line 228

Can you please help me out this too?