What could be causing the "Undefined value __SitePlugin::[“Used Cars: personalize: trading-in To Text”] error in Webflow when selecting dropdown values on a form submission?

The "Undefined value __SitePlugin::[“Used Cars: personalize: trading-in To Text”]" error in Webflow typically occurs when there is a mismatch between the value options in a dropdown field and the corresponding data in the Webflow CMS.

Here are a few possible causes and solutions for this error:

1. Missing or incorrect value in the dropdown field: Check the dropdown field in your form and ensure that all the options are correctly spelled and match the values in your Webflow CMS. Make sure there are no extra spaces or special characters in the values.

2. Invalid reference to CMS field: If you are using dynamic options in the dropdown field and referencing a CMS field, double-check the field name and make sure it exists in the collection you are referencing. If the field name has been changed or deleted, update the reference accordingly.

3. Corrupted or missing site backups: If the issue persists, it's possible that the CMS data or site backups have become corrupted or lost. In this case, restoring a previous backup of your site might resolve the issue. You can contact Webflow support to request assistance with restoring a backup.

4. Custom code conflicts: If you have any custom code or third-party integrations on your site, there may be conflicts causing the error. Try temporarily disabling any custom code or disabling third-party integrations one by one to identify the conflicting script. If the error disappears after disabling a specific code snippet or integration, you can isolate and address the issue accordingly.

5. Webflow platform bug or caching issue: In rare cases, the error could be caused by a bug on the Webflow platform or a caching issue. To rule out this possibility, clear your browser cache, try using an incognito or private browsing window, or try accessing the form on a different device or network. If the error persists, reach out to Webflow support for further assistance.

It's worth noting that without more specific information about your Webflow project's setup, it's difficult to pinpoint the exact cause of the "Undefined value" error. If none of the above solutions resolve the issue, you may need to provide additional details or collaborate with Webflow's support team to investigate further.