Can't Access Image URL on Single Page I have the 404 page setup as a single in sections under page404.

I have a postImage field that pulls images from assets.  It is assigned to the page404 field layout and it is assigned in the entry.  

I tried the this template approach:

{% set notFound = craft.entries.section('page404') %}
&lt;img src="{{ notFound.postImage.first().url }}" width="800" height="800" alt=""&gt;


but I keep getting the following error:


  Impossible to access an attribute ("url") on a null variable


What am I doing wrong, and how should it be template?
You left off the .first().

{% set notFound = craft.entries.section('page404').first() %}


Without that, the Element Criteria Model will default to .find().


first - Returns a single Entry Model.
find - Returns an array of Entry Models.


It doesn't matter this this is a Single section! All Element Criteria Models have the same behavior, whether they're fetching data from a Single, Channel, or Structure.