Several errors after activation

Hi there,

after successful installation, several erros showing.

1- click on dashboard, the error says:
Fatal error: Call to undefined function is_customize_preview() in /home/comremraam/public_html/wp-content/plugins/connections/includes/shortcode/class.shortcode-connections.php on line 33

2- once click on the category to create new, an error says:
Fatal error: Access level to CN_Term_Admin_List_Table::get_bulk_actions() must be public (as in class WP_List_Table) in /home/comremraam/public_html/wp-content/plugins/connections/includes/template/class.template-list-table-term-admin.php on line 701

any clue how to solve this ??

https://ww.wp.xz.cn/plugins/connections/