NighthawkCH

I had the same error. It was a problem with WP Opulus and the plugin NextGen Gallery. When I deactivated the plugin all works fine. But deactivating the plugin can’t be the solution.

After a few tests I figured out that the problem are this lines in the featured.php:

$original_query = $wp_query;
$wp_query = null;
$wp_query = new WP_Query(array('page_id' => $left_featured, 'posts_per_page' => 1));

This codeblock is 3 times in the file for left, center and right post.

I found 2 solutions but I don’t know why it works (I’m new in WP), I only know “It works for me for the moment”.

Solution 1: Comment out $wp_query = null;
Solution 2: Change $wp_query = new WP_Query(arr... ' => 1)); to $wp_query = new WP_Query() and after this line add $wp_query->query('page_id='.$left_featured.'&posts_per_page=1');. Don’t forget to change the variable (left, center, right).

I hope it will help.

Without rolling back to a earlier version, for me was the solution to edit the header.php.
I changed line 30 from get_template_part('parts/banner'); to get_template_part('parts/header', 'banner');