iPage Theme Install with Full Demo Content

Hello,
I need help with my Highland Theme import and also the Full Demo content import.
My host provider is iPage and I’m on VPS hosting.
There are 2 main issues going on:
1) The Full Demo Content would not load. I received error messages. I really need the full Demo Content for creation of my site.
2) I installed the Highland Theme via WordPress but there are glitches even without the Demo Content. For example, when I try to create a Pate using the Landing Page Template, I am getting the error message:
Fatal error: Cannot redeclare layerslider_init() (previously declared in /home/lebbskin/public_html/wp-content/plugins/LayerSlider/wp/shortcodes.php:6) in /home/lebbskin/public_html/wp-content/plugins/LayerSlider/wp/shortcodes.php on line 47
Please HELP! I can give you all login info via a private message. In order for you to access the site via WordPress I will have to give you a line of code to edit your host file on your computer (I’m creating a new WordPress site to replace my Weebly site using the same domain, and my Weebly site is currently what is active for everyone to see) OR I can give you the cPanel login if that is easier…please advise.
Thank you!