Undefined offset: 1 after creating Multisite

Hello, I followed the instructions on creating a multisite with the command

php please multisite

unfortunately now I get the error: Undefined offset: 1 Illuminate\Foundation\Bootstrap\HandleExceptions::handleError vendor/statamic/cms/src/Stache/Stores/CollectionEntriesStore.php:35

Its coming from the sites.php since I changed it to:

'sites' => [

        'default' => [
            'name' => config('app.name'),
            'locale' => 'en_US',
            'url' => '/',
        ],
        'two' => [
            'name' => 'two',
            'locale' => 'de',
            'url' => '/two/',
        ],

Any idea where that is coming from?