SharePoint Wiki Updated Pages Invalid index (Exception from HRESULT: 0x80070585)

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.

We’re having a problem opening this location in File Explorer.

There are a few circumstances under which you may come across this error :

We’re having a problem opening this location in File Explorer.  Add this web site to your Trusted Sites list and try again

Here I will provide a solution for one of those – You are trying to open a SharePoint document library in explorer view while on the SharePoint server.

There is an excellent post here that provides a detailed description of the problem and solution, but to summarise, you need to install the Desktop Experience feature under User Interfaces and Infrastructure on the server.