I'm trying to install demo data on one of my subdomains on my multisite - http://sutherlandyoga.thebuzzwriter.com/ - from the Yogastudio, Gym and Healthcare WP Theme (https://themeforest.net/item/yogastudio-gym-and-healthcare-wp-theme/14121782).
Every time I try the upload I receive this error https://www.dropbox.com/s/8iwaxiw7g5z4j93/Screenshot%202016-08-16%2016.27.03.png?dl=0
When looking into solutions I have tried to add php.ini file as per your blog, change 'debug' in wp-crofig.php to 'true', and other items (which Defender promptly told me to rectify as errors!) and still no luck.
Can you help?