What does "Duplicate Slugs" mean and how do I fix it?

The word "slug" refers to your campaign URL. If you're seeing an error regarding "Duplicate slugs'", it means that your campaign is using the same URL as another campaign. If you've created multiple drafts of a campaign, or have run multiple campaigns , you may have set the URL as the same URL for multiple campaigns. Alternatively , someone else may have had the same campaign URL as you. 

Either way, you can change your campaign URL by clicking this link and following the steps in this article.