fix

lib/Providers/DefaultServiceProvider.php

@@ -0,0 +1,21 @@
+<?php
+
+
+namespace  Bx\Nullable\Providers;
+
+
+use Wt\Core\Interfaces\IApp;
+use Wt\Core\Providers\ADefaultServiceProvider;
+
+class DefaultServiceProvider extends ADefaultServiceProvider
+{
+
+    public function register(IApp $app)
+    {
+        parent::register($app);
+
+        $container = $this->app->container();
+        $config = $this->app->config();
+
+    }
+}