Hello world!

Fatal error: Uncaught Error: Call to undefined function twentyeleven_posted_on() in /home/kaisei30/kaisei-kumiai30.com/public_html/wp-content/themes/kaisei_kumiai/content.php:24 Stack trace: #0 /home/kaisei30/kaisei-kumiai30.com/public_html/wp-includes/template.php(792): require() #1 /home/kaisei30/kaisei-kumiai30.com/public_html/wp-includes/template.php(725): load_template('/home/kaisei30/...', false, Array) #2 /home/kaisei30/kaisei-kumiai30.com/public_html/wp-includes/general-template.php(206): locate_template(Array, true, false, Array) #3 /home/kaisei30/kaisei-kumiai30.com/public_html/wp-content/themes/kaisei_kumiai/archive.php(19): get_template_part('content', 'topline') #4 /home/kaisei30/kaisei-kumiai30.com/public_html/wp-includes/template-loader.php(106): include('/home/kaisei30/...') #5 /home/kaisei30/kaisei-kumiai30.com/public_html/wp-blog-header.php(19): require_once('/home/kaisei30/...') #6 /home/kaisei30/kaisei-kumiai30.com/public_html/index.php(17): require('/home/kaisei30/...') #7 {main} thrown in /home/kaisei30/kaisei-kumiai30.com/public_html/wp-content/themes/kaisei_kumiai/content.php on line 24