Thank you for your quick response. I have removed that option from my live site as I don’t want making any trouble for the visitors, till the issue is fixed. Here is the link to a test environment where I get the same issue.
https://122.166.23.155:83/mopheth/packages/best-value-package/
Right now, test mode is on. It’s not working in both test and live mode. I have tried this in fresh wordpress install too with twentytwelve theme. Still the same error. Hope you can find a solution for me.