Updating Built-In Policies for Presto 3.9
The 3.9 release has added a built-in policy which you must add to your existing Presto Repository when you migrate from 3.5 or higher to 3.9.
1. Login to Presto and click 
Admin Console in the Presto Hub main menu. 2. Expand the Security & Policies section and click Reset Policies.
3. Click Reset Default Policies.
This resets the default policies for 3.9 which also adds the new policy Presto requires. This does not affect any custom policies you have already put in place.
