500 Internal Server Error for a PHP file on LAMP server -


i have simple code generate captcha image : 

<?php     session_start();     $captchanumber = 'abcdefghijklmnopqrstuvwxyz1234567890abcdefghijklmnopqrstuvwxyz';     $captchanumber = substr(str_shuffle($captchanumber), 0, 6);     $_session["code"] = $captchanumber;     $image = imagecreatefromjpeg("bj.jpg");     $foreground = imagecolorallocate($image, 175, 199, 200); //font color     imagestring($image, 5, 15, 15, $captchanumber, $foreground);     header('content-type: image/png');     imagepng($image); ?>

on localhost image generated , on lamp gives 500 internal error. checked php.ini setting : 

 session.save_handler = files

is there other setting need check / change ?


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