Hi
Yes, these error mesages are written by Nuke.
In Nuke 12, the cryptomatte node is a custom plugin that you have to install.
By default, RR sets the NUKE_PATH to the folder RR\render_apps\renderer_plugins\nuke\win_x64\12\
You can place plugins and an init.py into that folder.
http://www.royalrender.de/help/Nuke.html
regards,
Holger Schönberger
Please use the rrKnights Tavern
or our support system for new questions.