Can't use dropbox, app must be set

[coffeestains1908]

Usage
Yii::$app->fs->write('filename.ext', 'contents');

Error - Configs
Invalid Configuration – yii\base\InvalidConfigException
The "app" property must be set.

        'fs' => [
            'class' => 'dosamigos\flysystem\DropboxFsComponent',
            'token' => 'token',
        ],

TypeError
Argument 2 passed to Spatie\Dropbox\Client::__construct() must be an instance of GuzzleHttp\Client or null, string given, called in C:\xampp\htdocs\yii-adserve\vendor\2amigos\yii2-flysystem-component\src\DropboxFsComponent.php on line 53

        'fs' => [
            'class' => 'dosamigos\flysystem\DropboxFsComponent',
            'token' => 'token',
            'app' => 'yii2-dropbox'
        ],