Fatal error: Uncaught Error: Call to undefined function is_ie() in /home/nk-tech/www/tc-aizu/wp/wp-content/themes/academy/header.php:233
Stack trace:
#0 /home/nk-tech/www/tc-aizu/wp/wp-includes/template.php(790): require_once()
#1 /home/nk-tech/www/tc-aizu/wp/wp-includes/template.php(725): load_template('/home/nk-tech/w...', true, Array)
#2 /home/nk-tech/www/tc-aizu/wp/wp-includes/general-template.php(48): locate_template(Array, true, true, Array)
#3 /home/nk-tech/www/tc-aizu/wp/wp-content/themes/academy/404.php(1): get_header()
#4 /home/nk-tech/www/tc-aizu/wp/wp-includes/template-loader.php(106): include('/home/nk-tech/w...')
#5 /home/nk-tech/www/tc-aizu/wp/wp-blog-header.php(19): require_once('/home/nk-tech/w...')
#6 /home/nk-tech/www/tc-aizu/index.php(17): require('/home/nk-tech/w...')
#7 {main}
thrown in /home/nk-tech/www/tc-aizu/wp/wp-content/themes/academy/header.php on line 233