I am trying to add new connection to a WPForms created form. I keep getting 'API list error: Constant API error'.

Why is this and what can I do about it?

Thank you,



Hello @MCC-MarCom ,


Based on that error code seems like the lists aren't syncing correctly, but we as Constant Contact wouldn't be able support any further troubleshooting unfortunately. The integration that you are using is developed by WordPress. Constant Contact support agents are not trained on WordPress’s product. You will need to contact Word Press for further assistance with this error.

However, this WPForms help document I found may be useful for that error code you are receiving, I have attached a link to it here for you.



John M
Community & Social Media Support

Did I answer your question? If so, please mark my post as an "Accepted Solution" by clicking the Accept as Solution button in the bottom right hand corner of this post.

  • Support Tips

    Reporting Metrics

    "Authenticating your emails is the best way to ensure your emails achieve maximum deliverability. If you have your own domain, setting up self-authentication is especially important! " - Will

    See Article
  • Support Tips

    Call-To-Action Links

    "Target your most engaged contacts by creating a segment. Create a special offer or show your appreciation!" - Caitlin

    See Article
  • Support Tips

    Read Before You Send a Test Email

    "Did you know? You can send unlimited test emails to your verified email address, but only 50 in a 24-hour period to non-verified email addresses." - Nick

    See Article