Form throwing wrong error message

Enonic version: 6.15
OS: MacOS Mojave

We copied a working form, and copied form -

  • We filled all values
  • Click the submit button
  • Form has been successfully submitted
  • Got the auto generated email that form has been submitted.

But after clicking submit button - instead of ‘Thankyou message’ its throwing the ‘Error message’

Also working fine in draft/master-- but its issue with published site. Anyone have any idea?
looks like a content issue but its working in draft/master…

Form link – Agreement - Business Reply Services -

Please create a ticket in the support desk for this