Link gives access denied

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Hey. So i implemented a custom CSS theme like documented. And when i activate it i can edit the areas i defined on the default.php. However when i click on one of the links in the menue i get an "Access Denied" Page

THe setup is like this:
One folder containing the default.php that links to other pages within the folder.

the links are set up like this:

<li><a href="<?php echo $this->getThemePath('Produkte.php'); ?>/Produkte.php">Produkte</a></li>

Has anybody an idea?

How can i make all pages in the folder editable?

Thanks very much!