Hello,
Sorry to say but this error usually displays when you’re trying to see a page in your WordPress dashboard that your User Role doesn’t have permission to see.
So, you might want to consult with the WordPress Support or your Hosting Provider (if there is some Restriction enabled from their end) on this as this concern is specifically at their end. The Theme directly isn’t responsible for it.
Further, for your ease you can check out an Article that might help you out:
https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-sorry-you-are-not-allowed-to-access-this-page-error-in-wordpress/
Note: Remember we cannot take any guarantee for 100% compatibility and smooth working of the said Solutions on this Article. This is just for your reference and ease. Hope you can understand !
Best Regards.
.
