the pro works error

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my site allways down in 48 hours, i find the pro allways take mistake:
David
[Thu Oct 17 04:36:20 2013] [error] [client 66.249.66.86] PHP Notice: Undefined index: HTTP_COOKIE in /home/xuansun/public_html/gtranslate/translate.php on line 153
[Thu Oct 17 04:36:28 2013] [error] [client 187.233.226.31] PHP Notice: Undefined variable: _SESSION in /home/xuansun/public_html/Acerdriversdownload.php on line 17, referer: http://www.laptop-software.com/acer-sof ... 7-drivers/
[Thu Oct 17 04:36:28 2013] [error] [client 180.76.6.225] PHP Notice: Undefined index: HTTP_COOKIE in /home/xuansun/public_html/gtranslate/translate.php on line 153
[Thu Oct 17 04:36:34 2013] [error] [client 27.153.187.25] PHP Notice: Undefined index: HTTP_COOKIE in /home/xuansun/public_html/gtranslate/translate.php on line 153, referer: http://www.laptop-software.com/cs/page/ ... HP&lang=ja
[Thu Oct 17 04:36:42 2013] [error] [client 27.153.187.25] PHP Notice: Undefined index: HTTP_COOKIE in /home/xuansun/public_html/gtranslate/translate.php on line 153, referer: http://www.laptop-software.com/cs/page/822/
[Thu Oct 17 04:36:44 2013] [error] [client 27.153.187.25] PHP Notice: Undefined index: HTTP_COOKIE in /home/xuansun/public_html/gtranslate/translate.php on line 153, referer: http://www.laptop-software.com/cs/page/ ... P&lang=ja/
[Thu Oct 17 04:36:45 2013] [error] [client 37.236.238.6] PHP Notice: Undefined variable: _SESSION in /home/xuansun/public_html/Acerdriversdownload.php on line 17, referer: http://www.laptop-software.com/acer-sof ... 7-drivers/
5:31:22 PM

Please solve this problem.

[Yana]

Hi,
Please consult with your hosting provider about $_SERVER['HTTP_COOKIE'] and variable: _SESSION variables. If you can see that notice, it means that this variables are not defined. The variables should be defined and accessible.

[[email protected]]

Hi,
Please consult with your hosting provider about $_SERVER['HTTP_COOKIE'] and variable: _SESSION variables. If you can see that notice, it means that this variables are not defined. The variables should be defined and accessible.

i am using VPS, how to set it by myself ?