(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
2.8 Beta from 08.01.2019
Short description of error
UV Magic Addon does not activate.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Go to Preferences, into addon tab, serach for UV, try to activate the UV Magic Addon. You will get a error message.