config debug

FrontendController.php

<?php
/**
 * Created by PhpStorm.
 * User: brewing
 * Date: 21.11.13
 * Time: 11:40
 */

namespace frontend\components;


use yii\helpers\VarDumper;
use yii\web\Controller;
use yii\web\HttpException;

class FrontendController extends Controller {

    public function beforeAction($action){
        VarDumper::dump(\Yii::$app->getRequest()->getUserIP());
        if (parent::beforeAction($action)) {
            if ($this->enableCsrfValidation && !\Yii::$app->getRequest()->validateCsrfToken()) {
                // avoid checking again if errorAction is called to display exception
                \Yii::$app->getRequest()->enableCsrfValidation = false;
                throw new HttpException(400, Yii::t('yii', 'Unable to verify your data submission.'));
            }
            return true;
        } else {
            return false;
        }

    }
} 

main-local.php

<?php
return [
	'preload' => [
		'debug',
	],
	'modules' => [
        'debug' => [
            'class' => 'yii\debug\Module',
            'allowedIPs' => ['127.0.0.1','192.168.0.62', '::1']
        ],
	],
];

main.php

<?php
$rootDir = __DIR__ . '/../..';

$params = array_merge(
	require($rootDir . '/common/config/params.php'),
	require($rootDir . '/common/config/params-local.php'),
	require(__DIR__ . '/params.php'),
	require(__DIR__ . '/params-local.php')
);

return [
	'id' => 'app-frontend',
	'basePath' => dirname(__DIR__),
	'vendorPath' => $rootDir . '/vendor',
	'controllerNamespace' => 'frontend\controllers',
	'modules' => [
		'gii' => 'yii\gii\Module'
	],
	'extensions' => require($rootDir . '/vendor/yiisoft/extensions.php'),
	'components' => [
		'request' => [
			'enableCsrfValidation' => true,
		],
		'db' => $params['components.db'],
//		'cache' => $params['components.cache'],
		'mail' => $params['components.mail'],
		'user' => [
			'identityClass' => 'common\models\User',
		],
		'log' => [
			'traceLevel' => YII_DEBUG ? 3 : 0,
			'targets' => [
				[
					'class' => 'yii\log\FileTarget',
					'levels' => ['error', 'warning'],
				],
			],
		],
		'errorHandler' => [
			'errorAction' => 'site/error',
		],
        'urlManager' => [
            'class'=>'yii\web\UrlManager',//Set class
            'enablePrettyUrl'=>true,
            'showScriptName' => false,
        ]
	],
	'params' => $params,
];

params-local.php

<?php
return [
];

params.php

<?php

Yii::setAlias('common', realpath(__DIR__ . '/../'));
Yii::setAlias('frontend', realpath(__DIR__ . '/../../frontend'));
Yii::setAlias('backend', realpath(__DIR__ . '/../../backend'));

return [
	'adminEmail' => '[email protected]',
	'supportEmail' => '[email protected]',

//	'components.cache' => [
//		'class' => 'yii\caching\FileCache',
//	],

	'components.mail' => [
		'class' => 'yii\swiftmailer\Mailer',
	],

	'components.db' => [
		'class' => 'yii\db\Connection',
		'dsn' => 'mysql:host=localhost;dbname=blog2',
		'username' => 'root',
		'password' => 'root',
		'charset' => 'utf8',
	],
];

SiteController.php

<?php

namespace frontend\controllers;

use common\helpers\Glyph;
use common\helpers\Typo;
use frontend\components\FrontendController;
use Yii;
use yii\web\Controller;
use common\models\LoginForm;
use frontend\models\ContactForm;
use common\models\User;
use yii\web\HttpException;
use yii\helpers\Security;

class SiteController extends FrontendController
{
	public function behaviors()
	{
		return [
			'access' => [
				'class' => \yii\web\AccessControl::className(),
				'only' => ['logout', 'signup'],
				'rules' => [
					[
						'actions' => ['signup'],
						'allow' => true,
						'roles' => ['?'],
					],
					[
						'actions' => ['logout'],
						'allow' => true,
						'roles' => ['@'],
					],
				],
			],
		];
	}

	public function actions()
	{
		return [
			'error' => [
				'class' => 'yii\web\ErrorAction',
			],
			'captcha' => [
				'class' => 'yii\captcha\CaptchaAction',
				'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null,
			],
		];
	}

	public function actionIndex()
	{
		return $this->render('index');
	}

	public function actionLogin()
	{
		if (!\Yii::$app->user->isGuest) {
			$this->goHome();
		}

		$model = new LoginForm();
		if ($model->load($_POST) && $model->login()) {
			return $this->goBack();
		} else {
			return $this->render('login', [
				'model' => $model,
			]);
		}
	}

	public function actionLogout()
	{
		Yii::$app->user->logout();
		return $this->goHome();
	}

	public function actionContact()
	{
		$model = new ContactForm;
		if ($model->load($_POST) && $model->contact(Yii::$app->params['adminEmail'])) {
			Yii::$app->session->setFlash('success', Typo::AlertBodyHelper(Glyph::icon(Glyph::GLYPHICON_BELL),'Thank you for contacting us. We will respond to you as soon as possible.'));
			return $this->refresh();
		} else {
			return $this->render('contact', [
				'model' => $model,
			]);
		}
	}

	public function actionAbout()
	{
		return $this->render('about');
	}

	public function actionSignup()
	{
		$model = new User();
		$model->setScenario('signup');
		if ($model->load($_POST) && $model->save()) {
			if (Yii::$app->getUser()->login($model)) {
				return $this->goHome();
			}
		}

		return $this->render('signup', [
			'model' => $model,
		]);
	}

	public function actionRequestPasswordReset()
	{
		$model = new User();
		$model->scenario = 'requestPasswordResetToken';
		if ($model->load($_POST) && $model->validate()) {
			if ($this->sendPasswordResetEmail($model->email)) {
				Yii::$app->getSession()->setFlash('success', 'Check your email for further instructions.');
				return $this->goHome();
			} else {
				Yii::$app->getSession()->setFlash('error', 'There was an error sending email.');
			}
		}
		return $this->render('requestPasswordResetToken', [
			'model' => $model,
		]);
	}

	public function actionResetPassword($token)
	{
		$model = User::find([
			'password_reset_token' => $token,
			'status' => User::STATUS_ACTIVE,
		]);

		if (!$model) {
			throw new HttpException(400, 'Wrong password reset token.');
		}

		$model->scenario = 'resetPassword';
		if ($model->load($_POST) && $model->save()) {
			Yii::$app->getSession()->setFlash('success', 'New password was saved.');
			return $this->goHome();
		}

		return $this->render('resetPassword', [
			'model' => $model,
		]);
	}

	private function sendPasswordResetEmail($email)
	{
		$user = User::find([
			'status' => User::STATUS_ACTIVE,
			'email' => $email,
		]);

		if (!$user) {
			return false;
		}

		$user->password_reset_token = Security::generateRandomKey();
		if ($user->save(false)) {
			// todo: refactor it with mail component. pay attention to the arrangement of mail view files
			$fromEmail = \Yii::$app->params['supportEmail'];
			$name = '=?UTF-8?B?' . base64_encode(\Yii::$app->name . ' robot') . '?=';
			$subject = '=?UTF-8?B?' . base64_encode('Password reset for ' . \Yii::$app->name) . '?=';
			$body = $this->renderPartial('/emails/passwordResetToken', [
				'user' => $user,
			]);
			$headers = "From: $name <{$fromEmail}>\r\n" .
				"MIME-Version: 1.0\r\n" .
				"Content-type: text/plain; charset=UTF-8";
			return mail($email, $subject, $body, $headers);
		}

		return false;
	}
}

Where is your main-local.php included?
Would be good to check the config that is acually given to the application.