jQuery Error

hi,

i try to make the navigation functionality of a single page website with your plugin.
i have listed all my pages one below the other and have set the “rel” with the relationship xfn.

my navigation now looks like this

<a href="https://mywebsite.com" rel="post-8">Linktitle 1</a>
<a href="https://mywebsite.com" rel="post-10">Linktitle 2</a>
<a href="https://mywebsite.com" rel="post-12">Linktitle 3</a>

when i then click a link the following error appears
TypeError: $("#" + scrollTarget[1]).offset() is null

do you have any idea what causes this?