Fatal error: Uncaught exception 'InvalidArgumentException' with message 'File "/var/www/vhosts/wbbdev.com/sustainablediets.wbbdev.com/assets/2019/02/citizen_generated_evidence.pdf" is not valid jpg, png or gif image.' in /var/www/vhosts/wbbdev.com/sustainablediets.wbbdev.com/wp-content/plugins/knowledge-hub/public/file_checker.php:102 Stack trace: #0 /var/www/vhosts/wbbdev.com/sustainablediets.wbbdev.com/wp-content/plugins/knowledge-hub/public/file_checker.php(31): imagecreatefromfile('/var/www/vhosts...') #1 {main} thrown in /var/www/vhosts/wbbdev.com/sustainablediets.wbbdev.com/wp-content/plugins/knowledge-hub/public/file_checker.php on line 102