Не могу получить конфигурацию объекта Magento

Я отслеживал единственную ошибку, которую я не знаю с тех пор, как долго она показывает мне.

Ниже мой файл config.xml

<?xml version="1.0"?>

<config>
<modules>
<Maven_Questionanswer>
<version>1.0.1</version>
</Maven_Questionanswer>
</modules>
<global>
<models>
<questionanswer>
<class>Maven_Questionanswer_Model</class>
<resourceModel>questionanswer_resource</resourceModel>
</questionanswer>
<questionanswer_resource>
<class>Maven_Questionanswer_Model_Resource</class>
<entities>
<questionanswer>
<table>question</table>
</questionanswer>
</entities>
</questionanswer_resource>
</models>
<resources>
<questionanswer_setup>
<setup>
<module>Maven_Questionanswer</module>
</setup>
<connection>
<use>core_setup</use>
</connection>
</questionanswer_setup>
<questionanswer_write>
<connection>
<use>core_write</use>
</connection>
</questionanswer_write>
<questionanswer_read>
<connection>
<use>core_read</use>
</connection>
</questionanswer_read>
</resources>
</global>
</config>

/app/code/local/Maven/Questionanswer/Model/Question.php

 <?php
/**
*
*/

class Maven_Questionanswer_Model_Question extends Mage_Core_Model_Abstract
{
public function _construct()
{
parent::_construct();
$this->_init('questionanswer/question');
}
}

?>

/app/code/local/Maven/Questionanswer/Model/Resource/Question.php

<?php
class Maven_Questionanswer_Model_Resource_Question extends Mage_Core_Model_Resource_Db_Abstract
{
/**
* Initialize resource model
*
* @return void
*/
public function _construct()
{
$this->_init('questionanswer/question', 'question_id');
}
}
?>

/magento1.9.2/app/code/local/Maven/Questionanswer/Model/Resource/Question/Collection.php

<?php
/**
*
*/
class Maven_Questionanswer_Model_Resource_Question_Collection extends Mage_Core_Model_Resource_Db_Collection_Abstract
{

protected function _construct()
{
$this->_init('questionanswer/question');
}
}
?>

/app/code/local/Maven/Questionanswer/sql/questionanswer_setup/install-1.0.1.php<?php

$installer = $this;
$installer->startSetup();
$table = $installer->getConnection()->newTable($installer->getTable('questionanswer/question'))
->addColumn('question_id', Varien_Db_Ddl_Table::TYPE_INTEGER, null, array(
'unsigned' => true,
'nullable' => false,
'AUTO_INCREMENT'=>true,
'primary' => true,
'identity' => true,
), 'Question ID')
->addColumn('username', Varien_Db_Ddl_Table::TYPE_TEXT, null, array(
'nullable' => false,
), 'Username')
->addColumn('email', Varien_Db_Ddl_Table::TYPE_TEXT, null, array(
'nullable' => false,
), 'Email username')
->addColumn('question', Varien_Db_Ddl_Table::TYPE_TEXT, null, array(
), 'Question')
->addColumn('product_id', Varien_Db_Ddl_Table::TYPE_INTEGER, null, array(
), 'Product ID')
->addColumn('store_id', Varien_Db_Ddl_Table::TYPE_INTEGER, null, array(
), 'Store ID')
->addColumn('status', Varien_Db_Ddl_Table::TYPE_INTEGER, null, array(
), 'Status')
->setComment('questionanswer questionanswer/question entity table');
$installer->getConnection()->createTable($table);

$installer->endSetup();
?>

Где я делаю ошибку? Я просто могу понять.