array_key_exists() problem

Hi everyone.I have a problem array_key_exists() this please help me...

Warning: array_key_exists() expects parameter 2 to be array, boolean given in /home/***/domains/***/public_html/incfiles/classes/core.php on line 288

Warning: array_key_exists() expects parameter 2 to be array, boolean given in /home/***/domains/***/public_html/incfiles/classes/core.php on line 288

Warning: array_key_exists() expects parameter 2 to be array, boolean given in /home/***/domains/***/public_html/incfiles/classes/core.php on line 288

Warning: array_key_exists() expects parameter 2 to be array, boolean given in /home/***/domains/***/public_html/incfiles/classes/core.php on line 288

Warning: Cannot modify header information - headers already sent by (output started at
/home/***/domains/***/public_html/incfiles/classes/core.php:288) in /home/***/domains/***/public_html/incfiles/head.php on line 27

Warning: Cannot modify header information - headers already sent by (output started at
/home/***/domains/***/public_html/incfiles/classes/core.php:288) in /home/***/domains/***/public_html/incfiles/head.php on line 28

Warning: Cannot modify header information - headers already sent by (output started at
/home/***/domains/***/public_html/incfiles/classes/core.php:288) in /home/***/domains/***/public_html/incfiles/head.php on line 30

you are edit data base ?

mysql database connection is OK,but site showed these errors

core.php upload here

core.txt

Try another browser to test

no any change

i have been done it but not any change

# Kilte (25.10.2013 / 19:14)
This is the cause of the problem:
core.php, line 269:

if(isset($set['lng_list'])) self::$lng_list = unserialize($set['lng_list']);

i can't find any error in here

# Kilte (25.10.2013 / 19:13)
Go to http://your-site/panel/index.p ... uages
Choose language and save.

No, browser not sends header HTTP_ACCEPT_LANGUAGE or error header. is determining a bag