Well for advising we’ve to look at whats going on with the template otherwise how we’ll be able to tell you whats the issue. We need to see what’s the error & what’s causing the error. As our demo is not showing errors it might happen because of your server or any other 3rd party plugins also.
Also you might want to check which version of PHP you’re using on your server. We recommend to use the latest version of PHP or at least 5.6. Please check that & let us know.