When adjusting the Sun settings in Revit 2016 or 2017 you may get this error: "Third party updater 'Sun and Shadow Settings Updater' has experienced a problem and its action had to be canceled."
|Revit error displayed when changing Sun settings|
The problem relates to Dynamo and since it gets installed automatically now you have to manually update it to resolve this issue.
Here is a link to Autodesk's knowledge base article on this:
FYI: Before I knew what was causing this I would just click Disable Updater and not experience any issues with normal Revit functionality.