You need to add
"autoload": { "psr-4": { "App\": "app/", .... "tulsiramk\dynamicdb\": "vendor/tulsiramk/dynamicdb/src/"
}
to your root composer.json
And run composer dump-autolo
////////////////////////////////////////////////
config/app.php
'providers' => [
.............
tulsiramk\dynamicdb\DynamicDBServiceProvider::class,
]