can't edit page

i have insatlled my live site on xampp to make changes in it but after login i can’t acces my dashbord it give error

Fatal error: Uncaught Error: Call to undefined function wp_remote_post() in C:\xampp\htdocs\magus\wp-admin\includes\dashboard.php:1262 Stack trace: #0 C:\xampp\htdocs\magus\wp-admin\includes\dashboard.php(28): wp_check_browser_version() #1 C:\xampp\htdocs\magus\wp-admin\index.php(15): wp_dashboard_setup() #2 {main} thrown in C:\xampp\htdocs\magus\wp-admin\includes\dashboard.php on line 1262

even when i try to to edit existing pages it gives errors

Fatal error: Uncaught Error: Call to undefined function wp_remote_get() in C:\xampp\htdocs\magus\wp-content\plugins\multiple-content-blocks\assets\inc\class-mcb.php:224 Stack trace: #0 C:\xampp\htdocs\magus\wp-content\plugins\multiple-content-blocks\assets\inc\class-mcb.php(201): MCB->refresh_blocks('31') #1 C:\xampp\htdocs\magus\wp-content\plugins\multiple-content-blocks\assets\inc\class-mcb.php(45): MCB->get_blocks('31') #2 C:\xampp\htdocs\magus\wp-includes\plugin.php(470): MCB->add_meta_box('page') #3 C:\xampp\htdocs\magus\wp-admin\edit-form-advanced.php(223): do_action('add_meta_boxes', 'page', Object(WP_Post)) #4 C:\xampp\htdocs\magus\wp-admin\post.php(211): include('C:\\xampp\\htdocs...') #5 {main} thrown in C:\xampp\htdocs\magus\wp-content\plugins\multiple-content-blocks\assets\inc\class-mcb.php on line 224

i’m actually new to wordpress and xampp and i’m unable to solve this proble please help thanks in advance