[Theme: Minimatica] error message after activation

I would like to adopt your Minimatica fashinating theme, but after activation the following error message:

Fatal error: Call to undefined method WP_Query::is_home() in …/wp-content/themes/minimatica/functions.php on line 132

What’s your suggestions?

http://ww.wp.xz.cn/extend/themes/minimatica/