Suppose we have an Entity field we rely upon to define the Entity instances name pattern.
It can happen sometimes - well it happened to me at least - that you get the ‘nice’ idea of getting rid of this field.
You can get this exception:
IllegalArgumentException: Can't find getter for property '' at class ...
not very informative as an Error output, anyway…
Changing the @NamePattern annotation in IDE or Studio will get things back to cool 
(hopefully)