Good morning
The cause maybe by you have not config your host. Here are the requirements for the TechOne theme
Before you begin the install, checking to ensure that you have the minimum requirements for the TechOne theme is WordPress 4.4.0 or highter, PHP 5.4 or highter and MySQL 5.4 or highter.
Recommended PHP Configuration Limits
Many issues that you may run into such as; white screen, demo content fails when importing, empty page content with Fusion Builder and other similar issues are all related to low PHP configuration limits. The solution is to increase the PHP limits. You can do this on your own, or contact your web host and ask them to increase those limits to a minimum as follows:
max_execution_time 180
memory_limit 128M
post_max_size 32M
upload_max_filesize 32M
You should check amd try again. If it does not work, please connect via skype: itsonla to get direct support on comming Monday.
Thank you and Have a nice weekend!
Regards,