Please note that this issue is related with the use of Paid Memberships Pro, not with the use of your theme. It’s best if you try to reach the plugin authors as they will be more informed and better suited to help you.
To go further, we invite you to post your request on their support forums:
You're trying to setup your theme but you're experiencing errors when importing the demo content? Or you've just followed the setup guide but your website doesn't look exactly like our demo? These are common issues for which you can find easy and quick fixes.
Feel free to review our theme on Themeforest! It helps us making our products more known to new potential customers, which allow us more time to improve the quality and develop new features. #SharingIsCaring ❤️