Loading templates within plugins

[drjink]

Yes, i found that one too but it doesn't seem to work.
Here is the thing, lets say i got a template named "my_template" and i want to load it within the plugin. According to that article i would write into my plugincode:

$templater = vB_Template::create('my_template');
$rendered = $templater->render();

And assume that i now have the contents of that template in $rendered, but it doesn't seem to work that way.
What i get with that plugin activated is some missing things in my header, but no PHP error! I didn't even use the plugin any further, only those 2 lines of code activated screw someting up in the board.