Undefined function get_post_format_slugs()

Hi,

I have an error after uploading an image to the media. The site nows says that the get_post_format_slugs() is undefined function.

This is the error produced

`( ! ) Fatal error: Call to undefined function get_post_format_slugs() in C:\wamp\www\phapcares\wp-includes\theme.php on line 1262
Call Stack
# Time Memory Function Location
1 0.0020 141776 {main}( ) ..\index.php:0
2 0.0030 143880 require( 'C:\wamp\www\phapcares\wp-blog-header.php' ) ..\index.php:17
3 0.0060 154520 require_once( 'C:\wamp\www\phapcares\wp-load.php' ) ..\wp-blog-header.php:12
4 0.0070 163368 require_once( 'C:\wamp\www\phapcares\wp-config.php' ) ..\wp-load.php:29
5 0.0110 220816 require_once( 'C:\wamp\www\phapcares\wp-settings.php' ) ..\wp-config.php:101
6 1.9971 14018496 do_action( ) ..\wp-settings.php:294
7 1.9971 14019368 call_user_func_array ( ) ..\plugin.php:406
8 1.9971 14019384 twentyten_setup( ) ..\plugin.php:406
9 1.9971 14020248 add_theme_support( ) ..\functions.php:79