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Magento Basic Question throught Reading The Tutorial

I am new to Magento. Some questions make me crazy in the tutorial on their document.
1, How to open the development mode in magento 1.5.1?

2，”Fatal error: Call to a member function load() on a non-object in D:PHPWebmagappcodelocalMagentotutorialWeblogcontrollersIndexController.php on line 7″

It means I can not instantiate a model object. Someone help me. This is my code below.

Controller:

    class Magentotutorial_Weblog_IndexController extends Mage_Core_Controller_Front_Action {
    public function testModelAction() {
        $params = $this->getRequest()->getParams();
        $blogpost = Mage::getModel('weblog/blogpost');
        echo("Loading the blogpost with an ID of ".$params['id']);
        $blogpost->load($params['id']);
        $data = $blogpost->getData();
        var_dump($data);
    }
}

Model:

class Magentotutorial_Weblog_Model_Blogpost extends Mage_Core_Model_Abstract {
    protected function _construct() {
        $this->_init('weblog/blogpost');
    }
}

Config.xml:

    <config>
    <modules>
        <Magentotutorial_Weblog>
            <version>0.1.0</version>
        </Magentotutorial_Weblog>
    </modules>
    <frontend>
        <routers>
            <weblog>
                <use>standard</use>
                <args>
                    <module>Magentotutorial_Weblog</module>
                    <frontName>weblog</frontName>
                </args>
            </weblog>
        </routers>
    </frontend>
    <models>
        <weblog>
            <class>Magentotutorial_Weblog_Model</class>
            <!--
            need to create our own resource, cant just
            use core_mysql4
            -->
            <resourceModel>weblog_mysql4</resourceModel>
        </weblog>
        <weblog_mysql4>
            <class>Magentotutorial_Weblog_Model_Mysql4</class>
        </weblog_mysql4>
    </models>
</config>

And my database name is blog_posts. Thanks in advance!

Magento Basic Question throught Reading The Tutorial

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