My site is at https://www.rajdhaniband.com/ when I’m updating a demo after uploading your theme. it is showing error like in the screenshot below. Actually im updating a demo on my subdomain at https://blog.rajdhaniband.com/
I hope you are well today and thank you for your question.
Please make sure you are using latest version of PHP on your server by referring the information provided in the following pages.
If you are still facing the issue then would you mind if I log in to your site and do some troubleshooting? If this is ok then could you please temporarily share me your site admin login details privately by adding them in the box having text “Enter your private content here (only you and forum moderators will be able to see it)”?
Solution for this topic
I logged into your site and saw the demo is not getting imported because you have not used https correctly on your website as in your site General Settings the URLs are without https as shown in the attached screenshot.
To resolve the issue, please either configure the https correctly or do not use at all.