After creating a SharePoint 2013 Wiki library, the quick launch navigation under Updated Pages reports “an error has occurred on the server.” When you click on the Updated Pages link it displays the error: Invalid index. (Exception from HRESULT: 0x80070585).
This error occurs when there is no index column in your Wiki list. To fix it, add a column for indexing:
Library Settings -> Index Columns: Create a new Index on the ‘Modified’ column.
There you have it. The problem should now be solved.