[wp-testers] any body can help with these error

[Sastra Purba]

Hi Buddy,

I'm just install new themes on my WP then I got my WP can't access with
these comment 
" Fatal error: Call to undefined function register_sidebar() in
D:\SASTRA
POENYA\Jack\Xampp\htdocs\wordpress\wp-content\themes\wordpress.fun\WordP
ressFun\functions.php on line 9"

Any body can help to resolve the problem

-Sastra