Hey Supporter,

I am really sorry for the delayed response.

I've checked your site and found that this issue is coming from payplans system plugin because you modified the this file.
root/plugins/system/payplans/payplans.php
Refer attached screenshot to see the changes.

We have already helped you to fix this and now it's restricting non subscribers to access your site.
Please take a look on this issue again and update us if still any issue persist.

Thank you for understanding !