Fatal error: Uncaught TypeError: extract(): Argument #1 ($array) must be of type array, null given in /home/scienceplus/public_html/SCIENCE-INCLUDE-DY/script_body.php:44 Stack trace: #0 /home/scienceplus/public_html/SCIENCE-INCLUDE-DY/script_body.php(44): extract(NULL) #1 /home/scienceplus/public_html/Conference/script.php(1): include('/home/sciencepl...') #2 /home/scienceplus/public_html/Conference/index.php(7): include('/home/sciencepl...') #3 {main} thrown in /home/scienceplus/public_html/SCIENCE-INCLUDE-DY/script_body.php on line 44