[TYPO3-mvc] Call to a member function registerReconstitutedObject() on a non-object

[Sebastian Schreiber]

Dear List,
I got the this error:

Call to a member function registerReconstitutedObject() on a non-object

for the following Code:

$rowIterator = 
t3lib_div::makeInstance('Tx_Extbase_Persistence_RowIterator');
while ($row = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($res))
{
     
$rowIterator->append(t3lib_div::makeInstance('Tx_Extbase_Persistence_Row', 
$row));
}
$GLOBALS['TYPO3_DB']->sql_free_result($res);
/* @var $dataMapper Tx_Extbase_Persistence_Mapper_DataMapper */
$dataMapper = 
Tx_Extbase_Dispatcher::getPersistenceManager()->getBackend()->getDataMapper();
$result = $dataMapper->map($this->objectType, $rowIterator);
return $result;

Any hints?
I think my Model is correct and the mapping should work correctly.

Many thanks in advanced.

-- 
Sebastian Schreiber

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