When I have activated the theme at local then it is showing me "Call to undefined function gd_info() in /var/www/html/difc/wp-content/themes/grandconference/lib/admin.lib.php on line 283 ". I don't know why this error occurs for the local set-up I have followed below steps:
Please guide me if I missed some step, I have followed to installation step from ref:- https://help.market.envato.com/hc/en-us/articles/202821510?_ga=2.35691877.497224052.1498724559-280673764.1489144428 .
When I comment the line 283 in the admin.lib.php file then the theme is working fine for me.
I have installed PHP GD lib on my local machine now it is working fine.
Here is the command for install GD lib in Ubuntu.
sudo apt-get install php5-gd
sudo service apache2 restart