Go to CUCM >> Call Routing >> Route Plan Report >> and look for all the Unassigned DN and then delete them. After this, try to create Route Point and you should be good. Also make sure that the DN you are chossing to create Route point should be unique and should not exist on CM before.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.