register form its not showing

Hi there! Congratulations for your complete plugin!

Im trying to set up the register form with a shortcode [wpmem_form register], but nothing happens. I recieved allways a blank page. I have displayed all fields and have not blocked any pages on general settings.
What Im missing??
Thanks for your asistence!
Fer

https://www.ads-software.com/plugins/wp-members/