If you meet like me a problem with this version and your own nodes like
Before inserting your blender.py (tested with the same as the one in the manual )
the problem is that the bl_icon = ‘GAME’ is no more accepted
(see Manual doc example blender.py here https://armory3d.org/manual/#/dev/logicnodes )… replace it with ‘QUESTION’ for example.
@Lubos , maybe manual doc is to be updated or a set GAME accepted again in this new temporary version ?
and maybe in the doc the list of accepted bl_icon