need help : preregister| UPDATE - Need help displaying Template - SOLVED

[Vaupell]

trying to post a template right under new thread..
made a plugin hooked to newthread_form_start

want to add the template elock_frame

PHP Code:

$replacement = '{vb:raw attachmentoption}';
$placement = '<br />{vb:raw elock}';
$newplacement = $replacement . $placement; 

$templater = vB_Template::create('elock_frame'); 
$elock = $templater->render(); 
vB_Template::preRegister('newthread', array('elock' => $elock));  
 
$vbulletin->templatecache['newthread'] = str_replace($replacement, $newplacement, $vbulletin->templatecache['newthread']); 


EDIT : Updated codebox


Get following error
Catchable fatal error: Argument 2 passed to vB_Template:reRegister() must be an array, string given, called in C:\xampp\xampp\htdocs\emod\newthread.php(300) : eval()'d code on line 6 and defined in C:\xampp\xampp\htdocs\emod\includes\class_core.php on line 3852

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First i render the template, and try to preregister it
so then later i add the str_replacemnet to add a {vb:raw var}

But as you can see, preregister dont allow var's only array's to be passed.
any ideas how to preregister then.