Error on theme activation

Good afternoon,

We purchased five themes through Envato Market and, during the installation process, when activating BeTheme, a fatal error occurs:

“A critical error occurred on this website. Please check the site admin email inbox for instructions. If you continue to have problems, please try the support forum.”

This is the first time this error has happened to us, as in previous installations for other websites we did not encounter any issues.

In the WordPress email, the error shown is the following:

# “Error details

An error of type E_ERROR was caused in line 4 of the file /home/equipotel/public_html/wp-content/themes/betheme/functions/modules/svg-sanitizer/data/XPath.php. Error message: Uncaught Error: Class "DOMXPath" not found in /home/equipotel/public_html/wp-content/themes/betheme/functions/modules/svg-sanitizer/data/XPath.php:4

Stack trace:

#0 /home/equipotel/public_html/wp-content/themes/betheme/functions/modules/svg-sanitizer/load.php(12): require_once()

#1 /home/equipotel/public_html/wp-content/themes/betheme/functions.php(201): require_once('/home/equipotel...')

#2 /home/equipotel/public_html/wp-settings.php(739): include('/home/equipotel...')

#3 /home/equipotel/public_html/wp-config.php(102): require_once('/home/equipotel...')

#4 /home/equipotel/public_html/wp-load.php(50): require_once('/home/equipotel...')

#5 /home/equipotel/public_html/wp-admin/admin.php(35): require_once('/home/equipotel...')

#6 /home/equipotel/public_html/wp-admin/themes.php(10): require_once('/home/equipotel...')

#7 {main} thrown”

How can we resolve this, considering that the five licences appear to be corrupted?