Error: 404 Not Found

Sorry, the requested URL 'http://u.limo/wp-admin/admin-ajax.php?channel_id=social_wechat&action=xh_social_channel&tab=login_redirect_to_authorization_uri&xh_social_channel=6c1aaac327&notice_str=1751600057&hash=2b2fa3f668f5799e043c193a907ba780&redirect_to=https%3A%2F%2Fu.limo%2Ftag%2F%25E7%2585%25A7%25E7%2589%2587%25E5%25A2%2599%25E5%25A4%259A%25E5%25B8%25A7%2F' caused an error:

Not found: '/wp-admin/admin-ajax.php'