Removed yii\debug\Module::enabled.

config/web.php

@@ -1,15 +1,8 @@
 <?php
 
-return array(
+$config = array(
 	'id' => 'bootstrap',
 	'basePath' => dirname(__DIR__),
-	'preload' => array('debug'),
-	'modules' => array(
-		'debug' => array(
-			'class' => 'yii\debug\Module',
-			'enabled' => YII_ENV_DEV,
-		),
-	),
 	'components' => array(
 		'cache' => array(
 			'class' => 'yii\caching\FileCache',
@@ -32,3 +25,11 @@ return array(
 	),
 	'params' => require(__DIR__ . '/params.php'),
 );
+
+if (YII_ENV_DEV) {
+	$config['preload'][] = 'debug';
+	$config['modules']['debug'] = 'yii\debug\Module';
+	$config['modules']['gii'] = 'yii\gii\Module';
+}
+
+return $config;