I installed My Calendar on another site with the same versions of WP, My Calendar and Calendar without any problems.
Now I am trying to install on the production website. When I select either of the following:
"You haven't entered any events, so My Calendar can't tell whether your database is up to date. If you can't add events, upgrade your database! Update Now"
"My Calendar has identified that you have the Calendar plugin by Kieran O'Shea installed. You can import those events and categories into the My Calendar database. Would you like to import these events? Import From Calendar"
I receive a message "Fatal error: Call to undefined function: wp_verify_nonce() in site-info/blog/wp-content/plugins/my-calendar/my-calendar-settings.php on line 7"