Fatal Error When Trying to Upload Theme to WP

I just purchased the theme. After 2 days of trying, I wasn’t able to install it to my Word Press site myself. I contacted Themeforest/Envato techs to do an installation, and they sent me the following message:
“I have an issue when importing the demo content since, there’s isn’t an xml files in the archive, you have to contact developer support. maybe they send an xml file or fix the issue. here’s the error message:
Importing didnt work! You might want to try reloading the page and then try again (The script returned the following message:
Fatal error: Cannot use object of type WP_Error as array in /nfs/c07/h04/mnt/106007/domains/promisecenteronline.org/html/wp-content/themes/enfold/enfold/config-woocommerce/admin-import.php on line 22”

Please help!