I updated Appointments+ and now my content is no longer

I updated Appointments+ and now my content is no longer showing. I only get the following error in place of my content:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class 'Appointments' does not have a method 'post_ceontent' in /home/xxxxxx/public_html/wp-includes/plugin.php on line 235

When I deactivate the plugin my content returns. I am using the Divi theme from Elegant themes. All my plugins, theme and WP are at the latest versions.