Welcome to our community!!! I’m not totally sure what could be wrong with your setup. But when I have such an error inside Lucees Administrator I stop Lucee and redeploy the complete Lucee Server context with the following steps:
Stop Lucee Service in the Windows services management console
Go to /path-to-lucee-installation/tomcat
Rename the directory /path-to-lucee-installation/tomcat/lucee-server into /path-to-lucee-installation/tomcat/lucee-server-bak
Restart Lucee service in Windows services management console and wait about 50seconds. You’ll see tomcat create a new /path-to-lucee-installation/tomcat/lucee-server (server context)
Try logging again into Lucee Server Admininstrator
If the same issue persist, post back. There could be other things that might cause the issue. You may need to renew you password by adding a password.txt with the password to the server context directory. But this we will go into later on.
I really don’t know because I never needed/wanted to run both engines in parallel. Maybe somebody can chime in that has experience with that.
But if I would need it, what I would do for sure is: run It with CommandBox. As far as I know CommandBox is the perfect software for this. It uses one servlet engine for both worlds, abstracting all settings by using a simple json configuration file. If you want to switch the cfengine, you just change the cfengine attribute in the json file. Also, it isolates each webroot into one and only servlet engine instance. Then it creates just one web context per imstance, so that no webroot would/could mess around with the other.
I think the problem is related to the operating system language, we examined the status with @taskinsafa again, this error occurs when lucee is installed on windows with Turkish installation. In windows with English installation, a trial was made on the pc and server, no problem.