下载contactform7 激活不了， 出现如下代码， 有哪位大神帮忙解决一下？

Fatal error:  Uncaught Error: Call to undefined function
get_user_locale() in
/home/wwwroot/http://www.xxx.com/wp-content/plugins/contact-form-7/includes/l10n.php:68
Stack trace:
#0
/home/wwwroot/http://www.xxx.com/wp-content/plugins/contact-form-7/settings.php(131):
wpcf7_load_textdomain()
#1 /home/wwwroot/http://www.xxx.com/wp-includes/plugin.php(524):
wpcf7_install('')
#2 /home/wwwroot/http://www.xxx.com/wp-admin/plugins.php(166):
do_action('activate_contac...')
#3 {main}
 thrown in /home/wwwroot/http://www.xxx.com/wp-content/plugins/contact-form-7/includes/l10n.php on line 68

大神们 我该如何解决？