zend framework Creating default object from empty value - php

Question

im trying to modify a code, when i submit the form im getting this error "Creating default object from empty value". I make n echo statment in $request->isPost is not echoing. this my code below
public function addAction() {
$report = new Report();
$request = $this->getRequest ();
$validateOnly = $request->isXmlHttpRequest ();
if ($validateOnly)
$this->setNoRenderer ();
$userObj = new User ( );
$userRow = $userObj->createRow();
$status = ValidationContainer::instance ();
$userArray = $userRow->toArray ();
$userArray['acls'] = User::getACLs ( $user_id ); //set acls
$this->viewAssignEscaped ( 'user', $userArray );
$locations = Location::getAll();
$this->viewAssignEscaped('locations', $locations);
//var_dump($locations); exit;
if ($request->isPost()) {
self::fillFromArray ( $userRow, $details );
$userRow->is_blocked = 0;
if ($id = $userRow->save ()) {
in the provider_code table.
$this->insertPlainPassword($this->getSanParam('password'), $id);
$status->setStatusMessage ( 'The new user was created.' );
$this->saveAclCheckboxes ( $id );
} else {
$status->setStatusMessage ( 'The user could not be saved.' );
}
}
}
}
i have been trying to resolve it for weeks now.
}