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Unknown error. SerializationException RequestID when adding workflow to a Collection
When trying to add a workflow to a Collection, or create a new Collection, the following error is observed:
Unknown error. SerializationException RequestID: xxxxxxx
This prevents the workflow from being added to a collection.
Additionally, you may notice that when you click on a Collection you see a 'Page Not Found' error.
Confirm you have recently upgraded your Server from version 2019.1 or lower to version 2019.2.
In 2019.2, a new interface for Collections, as well as some additional functionality for Collections, was added to the Gallery. A hard refresh is needed for this to render properly and your Collections to appear.
On the home page of your Gallery, perform a hard refresh by clicking Shift + F5
Confirm you now see the new grid interface for collections:
How To: Manage a Collection