It seems, that this issue is caused by outdated version of your PhP. Please check your current version of PhP and if it is lower than 5.6.33 – please switch your current PhP version to 5.6.33 It is possible to perform via cPanel or other similar control panel for the hosting. You may also ask your hosting support to upgrade PhP version.
Also, please read this article " How to increase PhP memory limit"
Every Time I load the demo contents the website never loads.
I have tried installing and uninstalling word press and the theme several time but no success. Please help me it's a new website.
After loading demo contents it simply shows loading sign like the one shown in the picture forever.
Hello, Dear Dipankar Chetia!
It seems, that this issue is caused by outdated version of your PhP. Please check your current version of PhP and if it is lower than 5.6.33 – please switch your current PhP version to 5.6.33 It is possible to perform via cPanel or other similar control panel for the hosting. You may also ask your hosting support to upgrade PhP version.
Also, please read this article " How to increase PhP memory limit"
http://www.wpbeginner.com/wp-tutorials/fix-wordpress-memory-exhausted-error-increase-php-memory/
Best Regards!