Avada shop theme can not be installed in wordpress

Avada shop theme can not be installed in wordpress:

I want to install the Avada shop theme in my wordpress hosting. I installed the plugins of Fusion Builder and Fusion Core, but something was wrong when I installed the woocommerce plugin and activated it. Now, I can not open my dashboard.

https://bicosmetics.com/wp-admin/

 Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 49152 bytes) in /home/content/p3pnexwpnas07_data02/89/42039389/html/wp-content/themes/Avada/includes/widget/class-fusion-widget-facebook-page.php on line 135

How can I resolve this problem?