The error comes from the “Shared secret key” that is probably misconfigured.
In 2 places, there should be the same setting:
Lucee / Tomcat: open {lucee-root}\conf\server.xml (or {lucee-root}\tomcat\conf\server.xml), and scroll down to the section with <Valve className=“mod_cfml.core” …>
Inside that tag, there should be an attribute sharedKey=“[some key]”
If it isn’t there, add it, and change [some key] to … some secret key.