How to install mod_muc_admin?

I have installed an ejabberd Server using ejabberd-15.03-linux-x86_64-installer.run

Now I want to use the module mod_muc admin. Is that possible? How can I install it?
When I enter "ejabberdctl module_install mod_muc_admin", I get an error message Error: not_available:

Thank you very much for your help. Claudia