Hello,
We apologize for the inconvenience you are experiencing with your form. The error you mentioned, “Backbone is not defined,” can occur due to a conflict with other plugins or themes on your website.
To troubleshoot and resolve this issue, we recommend the following steps:
- Check for Plugin and Theme Conflicts: Temporarily deactivate all other plugins and switch to a default WordPress theme (e.g., Twenty Twenty-One). Then, check if the issue persists. If the problem is resolved, it indicates that there was a conflict with one of the plugins or the theme. You can then reactivate the plugins and themes one by one to identify the specific one causing the conflict.
- Clear Your Browser Cache: Sometimes, browser caching can cause issues with how pages are displayed. Clear your browser cache and refresh the page to see if that resolves the problem.
- Update Ninja Forms and Its Add-ons: Ensure that you are using the latest versions of Ninja Forms and its add-ons. Outdated versions can sometimes cause compatibility issues.
- Check JavaScript Errors: Use your browser’s developer tools to check for any additional JavaScript errors on the page. This can provide further insights into the cause of the issue.
- Verify Form Settings: Double-check the form settings to ensure that the multiple parts are correctly configured. Make sure each part is enabled and arranged in the desired order.
If the issue persists after trying these steps, please reach out to our Customer Success team. As they are dedicated to helping you resolve any problems and ensure your form is working as expected.
