php - Magento error: call to member function on a non-object

I have this error message:

Fatal error: Call to a member function load() on a non-object in /home/autoco/public_html/shop/app/code/core/Mage/Core/Model/Abstract.php on line 225

How to fix this?

    
        1.0.0
    


    

        
            Becker_Tec_Model
            tec_resource
            
                Becker_Tec_Model_Resource
                
                    
                        tof_manufacturers
                    
                

            
        
    


    
        
            standard
            
                Becker_Tec

                tecdoc
            
        
    
 

Model class:

class Becker_Tec_Model_Manufacturers extends Mage_Core_Model_Abstract
{

  protected function _construct()
   {
    $this->_init('tec/manufacturers');
   }
  public function test(){
    $this->getCollection()->load(15);

  }

}

Resource class:

class Becker_Tec_Model_Resource_Manufacturers extends    Mage_Core_Model_Resource_Db_Abstract {


  protected function _construct()
   {
    $this->_init('tec/manufacturers', 'tof_manufacturers_id');
   }

} 

Test Page:

require_once("app/Mage.php");

Mage::app();

$data = Mage::getModel("tec/manufacturers");
$data->load(136);
print_r($data);

Answer

Was the culprit as it didn't recognize how to hook up your call.

First of all use the same naming convention to avoid driving yourself mad.

Config xml model section:

    
        Becker_Tec_Model
        becker_tec_resource
    
    
        Becker_Tec_Model_Resource
        
            

                becker_tec
            
        
    

Model Class:

class Becker_Tec_Model_Tec extends Mage_Core_Model_Abstract 

{
    protected function _construct()
    {
        $this->_init( 'becker_tec/tec' );
    }   

Resource class:

class Becker_Tec_Model_Tec_Resource_Tec extends Mage_Core_Model_Resource_Db_Abstract

{
    protected function _construct()
    {
        $this->_init( 'becker_tec/tec', 'entity_id' );
    }

Collection class: ( If you want to use built in collection mechanisms )

class Becker_Tec_Model_Tec_Resource_Tec_Collection extends Mage_Core_Model_Resource_Db_Collection_Abstract

{
    public function _construct()
    {
        parent::_construct();
        $this->_init( 'becker_tec/tec' );
    }

Place them in the appropriate folders and you'll be able to call:

$oTec = Mage::getModel( 'becker_tec/tec' );