Hi everyone,
I got this error message after having updated to MacOS Catalina. Apparently the update deleted various vectorworks files in different locations. Restoring this one from the backup solved the issue for me:
Macintosh HD/Library/Preferences/net.vectorworks.vectorworks.2019.plist
These other folders/files I restored from the backup to get the license and user settings work again:
user/library/preferences/net.nemetschek.vectorworks.2019.plist
user/library/preferences/net.nemetschek.vectorworks.license.2019.plist
user/library/application support/vectorworks
user/library/application support/vectorworks RMCache
user/library/application support/vectorworks-installer
user/library/application support/vectorworks-installer-wrapper
user/library/application support/vectorworks-updater
Macintosh HD/Library/Application Support/Vectorworks 2019