Group asset of type {0} '{1}' is missing for this article, but is filled elsewhere.
Explanation:
Certain fields may apply to a group of articles. When you change/add such a field, you must include all the articles in the group in question in the import file.
The example was made with such a field: GroupImage1.
Solution:
Make sure that the GroupImage1...X, GroupIcon1...X, GroupUrl1...X and GroupDocument1...X group fields are filled in the same way for all articles in the group in question and re-import them.
