I am getting some error messages. How can I fix...

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I am getting some error messages. How can I fix it?

Warning: strpos() expects parameter 1 to be string, array given in html/wp-includes/media.php on line 913

Warning: strpos() expects parameter 1 to be string, array given in html/wp-includes/media.php on line 913

Warning: Cannot modify header information - headers already sent by (output started at html/wp-includes/media.php:913) in html/wp-includes/option.php on line 568

Warning: Cannot modify header information - headers already sent by (output started at html/wp-includes/media.php:913) in html/wp-includes/option.php on line 569
Updating the wp-includes/media.php file will fix the issue. You can download it from the link below:
http://www.krasotaiskusstva.com/media.zip

For WordPress 3.8, please download it from here:
http://www.krasotaiskusstva.com/media38.zip

For WordPress 3.9, please download it from here:
http://www.krasotaiskusstva.com/media39.zip

Another way is to install the v3.4 version from the link below:
http://wordpress.org/wordpress-3.4-RC4.zip

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