Fatal error: Uncaught Error: Call to undefined function image_constrain_size_for_editor() in /srv/users/serverpilot/apps/thaiis/public/wp-includes/media.php:266
Stack trace:
#0 /srv/users/serverpilot/apps/thaiis/public/wp-includes/media.php(953): image_downsize(2724, 'thumbnail')
#1 /srv/users/serverpilot/apps/thaiis/public/wp-includes/media.php(1028): wp_get_attachment_image_src(2724, 'thumbnail', false)
#2 /srv/users/serverpilot/apps/thaiis/public/wp-includes/post-template.php(1630): wp_get_attachment_image(2724, 'thumbnail', false, '')
#3 /srv/users/serverpilot/apps/thaiis/public/wp-includes/media.php(2461): wp_get_attachment_link(2724, 'thumbnail', false, false, false, '')
#4 /srv/users/serverpilot/apps/thaiis/public/wp-includes/shortcodes.php(356): gallery_shortcode('', '', 'gallery')
#5 [internal function]: do_shortcode_tag(Array)
#6 /srv/users/serverpilot/apps/thaiis/public/wp-includes/shortcodes.php(228): preg_replace_callback('/\\[(\\[?)(galler...', 'do_shortcode_ta...', '<p><!--:en-->[g...')
#7 /srv/users/server in /srv/users/serverpilot/apps/thaiis/public/wp-includes/media.php on line 266