conflict with orbit fox companion

i just switched to multisite. the main site got error when i activate orbit fox plugin.

Fatal error: Uncaught Error: Call to undefined function wp_get_current_user() in C:\xampp\htdocs\site\wp-includes\capabilities.php:692 Stack trace: #0 C:\xampp\htdocs\site\wp-content\plugins\ultimate-member\includes\core\class-access.php(547): current_user_can(‘administrator’) #1 C:\xampp\htdocs\site\wp-content\plugins\ultimate-member\includes\core\class-access.php(703): um\core\Access->get_post_privacy_settings(Object(WP_Post)) #2 C:\xampp\htdocs\site\wp-includes\class-wp-hook.php(292): um\core\Access->filter_protected_posts(Array, Array) #3 C:\xampp\htdocs\site\wp-includes\plugin.php(212): WP_Hook->apply_filters(Array, Array) #4 C:\xampp\htdocs\site\wp-includes\post.php(5901): apply_filters(‘get_pages’, Array, Array) #5 C:\xampp\htdocs\site\wp-content\plugins\themeisle-companion\obfx_modules\policy-notice\init.php(367): get_pages(Array) #6 C:\xampp\htdocs\site\wp-content\plugins\themeisle-companion\obfx_modules\policy-notice\init.php(111): Policy_Notice_OBFX_Module->get_policy_pages_array() #7 C:\xampp\htdocs\site\wp-co in C:\xampp\htdocs\site\wp-includes\capabilities.php on line 692
There has been a critical error on this website.