If you have your form embedded with:
- SSO enabled
- Smartv embeded with session enabled
- Communities with SSO enabled and embeded
And third party cookies are disabled, you will get 'ERROR' - to resolve this issue cookies must be enabled.
Click on link below and it will show you how to enable cookies for your browser:
https://www.resonline.com/support/resources/7-articles/54-enable-cookies