CANNOT USE QUIX TO BUILD LANDING PAGE

I keep getting this error when I try to use Quix page builder in order to create a simple landing page until my website has content

Parse error: syntax error, unexpected '[' in /home/phat4lif/public_html/libraries/quix/vendor/illuminate/support/helpers.php on line 358

I want my landing page to look similar to this, with a contact form that sends the data to my email address, so I build up my email list BEFORE users can beging to log in. I don't want anybody logging in until my website has been constructed.

Here is the link to a landing page I created using WebPlus X5 and is how I want my Joomla website to appear. Please advise on how I can achieve this with my Joomla website. I have also purchased the EasySocial Bundle, which is what I plan to use for my final website. The landing page will be temporary just until I am able to put more content on my EasySocial website. Please examine the landing page I created below:
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MY LANDING PAGE