Ugly SQL Error when Unioning two views

Here the error:

user warning: Unknown column 'node_data_field_cover_image.field_cover_image_fid' in 'field list' query: (SELECT node.nid, node.created AS node_created_created, node.title AS node_title, node.changed AS node_changed, node.created AS node_created, node_data_field_cover_image.field_cover_image_fid AS node_data_field_cover_image_field_cover_image_fid, node_data_field_cover_image.field_cover_image_title AS node_data_field_cover_image_field_cover_image_title, node_data_field_cover_image.field_cover_image_alt AS node_data_field_cover_image_field_cover_image_alt, node_data_field_inhalt.field_inhalt_value AS node_data_field_inhalt_field_inhalt_value, node_data_field_inhalt.field_inhalt_format AS node_data_field_inhalt_field_inhalt_format FROM node node LEFT JOIN term_node term_node ON node.nid = term_node.nid LEFT JOIN term_hierarchy term_hierarchy ON term_node.tid = term_hierarchy.tid WHERE (node.type IN ('story')) AND (term_node.tid IN ('49')) ORDER BY node_created_created DESC) ORDER BY node_created_created DESC in /www/htdocs/wlp/neu/includes/database.mysql.inc on line 172.

What I did. I have a views, that takes a one node from a certain type and a certain taxonomy term. I dublicated the view, renamed it and put in there an other taxonomy term. So, the views is exactely the same, but for the name and taxonomy term. Also with the union view I didn't select to give a page view.

Hope you know where the bug is.