My website www.concertenwittekerk.nl is built in RW7. Downloading RW8 I followed the instructions to activate the app, entered the license key and activated the license button.
After importing my project ConcertenWitteKerk.rw in RW8 only the Edit-mode is available. Switching to Preview this message appears;
valueForUndefinedKey:]:this class is not key value
coding-compliant for the key_exporter.
I hope someone can unravel this mysterious message and explain me step by step how to go to work.