@Gigarx, It must be a one of permission issue, the tomcat needs a permission for write the root directory. Please check your installed tomcat directory.
As @Jordan_Michaels and @cfmitrah already stated, it is very probably a permission issue. Did you install Lucee with the installer? If yes, and you didn’t change the account that is running the lucee service manually afterwards (what I guess), check if you your folder C:\lucee\tomcat\webapps\ROOT still have the user “LOCAL SERVICE” with full read/write permissions on it. “LOCAL SERVICE” is a lower priviliged user account that runs the lucee-tomcat service (for security reasons), and you need to grant full access to it there, so it can create the web-inf folders. Usually the installer does this, but sometimes copying folders/files or overwriting folders may change permissions. May happen if you are copying a wwwroot from a classic old app to a new lucee installation. Hope my guess is a hit.