Corrección errores plugin Eventon

Buenos días,
Mi nombre es  Manuel de GuiaTcastellon.com Quisiera que me solucionasen una serie de errores que salen en el plugin EventOn (https://www.myeventon.com/). Son los siguientes:

En Idiomas:
Uncaught Error: [] operator not supported for strings in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/admin/class-admin.php:180 Stack trace: #0 /var/www/vhosts/guiatcastellon.com/httpdocs/wp-includes/class-wp-hook.php(288): evoau_admin->evoAU_language_additions(Array) #1 /var/www/vhosts/guiatcastellon.com/httpdocs/wp-includes/plugin.php(206): WP_Hook->apply_filters(Array, Array) #2 /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventON/includes/admin/settings/settings_language_tab.php(39): apply_filters('eventon_setting...', Array) #3 /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventON/includes/admin/settings/eventon-admin-settings.php(143): evo_settings_lang->get_content() #4 /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventON/includes/admin/class-evo-admin.php(147): eventon_settings() #5 /var/www/vhosts/guiatcastellon.com/httpdocs/wp-includes/class-wp-hook.php(288): evo_admin->eventon_settings_page('') #6 /v in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/admin/class-admin.php on line 180

En  Action User:
Warning: Illegal string offset 'evo_customfield_1' in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/class-frontend.php on line 251

Notice: Array to string conversion in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/class-frontend.php on line 251

Warning: array_merge(): Argument #2 is not an array in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/class-frontend.php on line 254

Warning: Invalid argument supplied for foreach() in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/admin/settings_page.php on line 110

Warning: Illegal string offset 'evo_customfield_1' in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/class-frontend.php on line 251

Notice: Array to string conversion in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/class-frontend.php on line 251

Warning: array_merge(): Argument #2 is not an array in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/class-frontend.php on line 254

Warning: Invalid argument supplied for foreach() in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/admin/settings_page.php on line 401

Notice: Undefined variable: FF in /var/www/vhosts/guiatcastellon.com/httpdocs/wp-content/plugins/eventon-action-user/includes/admin/settings_page.php on line 404

Gracias de antemano,

Manuel.