Why is the screen blank when I try to use Avatax for PrestaShop?

Overview

The screen turns blank even after logging out and closing the browser when we install the Avatax Module for PrestaShop.

PrestaShop

Confirm the standard installation process was followed and you are using a compatible version:
- Avalara AvaTax for PrestaShop is compatible with versions 1.5.2.x and 1.6.1.x of Prestashop as of April 1, 2016
- See PrestaShop for current user guide and standard installation process
If following standard installation and configuration process does not resolve the issue please contact Avalara Technical Support , include your PrestaShop store version