LTi authenticator setup

Hi Rod: it seems you are quite familiar with LTI authentication. I am having problems to configure LTI Autentication in TLJH (The Little Jupyter Hub) distribution. I have already installed “jupyterhub-ltiauthenticator” by using the command above but when I follow the instructions at https://github.com/jupyterhub/ltiauthenticator, it seems that something is wrong. I have tried to amend the jupyterhub_config.py in order to include some lines to import ltiautheticator class but the server does not start and some error messages indicating that the class can not be found. I’d appreciate any help from your side.
Best regards,
JM