Ensure that the directory doesn't already exist

app.php

@@ -0,0 +1,14 @@
+<?php
+
+use Opdavies\DrupalModuleGenerator\Command\GenerateDrupal7Command;
+use Symfony\Component\Console\Application;
+
+require_once __DIR__.'/vendor/autoload.php';
+
+$app = new Application();
+
+$app->addCommands([
+    new GenerateDrupal7Command(),
+]);
+
+$app->run();