My newsletter creation function is suddenly not working. Attempting to create a newsletter results in this error:
Error Details
=============
An error of type E_ERROR was caused in line 40 of the file /home2/pmenjgmy/public_html/wp-content/plugins/newsletter/emails/composer.php. Error message: Uncaught Error: Undefined constant NewsletterComposer::instance in /home2/pmenjgmy/public_html/wp-content/plugins/newsletter/emails/composer.php:40
Stack trace:
#0 /home2/pmenjgmy/public_html/wp-content/plugins/newsletter/includes/module-admin.php(177): require()
#1 /home2/pmenjgmy/public_html/wp-includes/class-wp-hook.php(324): NewsletterModuleAdmin->menu_page(”)
#2 /home2/pmenjgmy/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(”, Array)
#3 /home2/pmenjgmy/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#4 /home2/pmenjgmy/public_html/wp-admin/admin.php(260): do_action(‘admin_page_news…’)
#5 {main}
thrown
How can I fix this? My host suggested uninstalling and reinstalling but was not sure if I would lose subscribers by doing so.