Why am I getting the error "Collection with this URL already exist" when trying to make changes in page settings on Webflow? I have a page with slug "blog" and a CMS collection with slug "blog", and my structure looks like '…' and '…'. I haven't changed the slugs.

The error "Collection with this URL already exists" appears when there is a conflict between the slug of a page and the slug of a CMS collection within your Webflow project. In your case, it seems that you have a page with the slug "blog" and a CMS collection also named "blog".

Webflow uses slugs to generate unique URLs for each page and collection, so having the exact same slug for both a page and a collection will result in a conflict.

To resolve this issue, you need to ensure that the slugs for your pages and collections are unique. Here's what you can do:

1. Change the slug of either the page or the collection: You can edit the slug of either the page or the collection to make them different from each other. For example, you can change the slug of the collection to "blog-posts" and leave the page slug as "blog".

2. Change the URL structure: If changing the slug of either the page or the collection is not an option, you can consider modifying the URL structure. For instance, you can change the page slug to "blog-posts" and the collection slug to "posts". This way, the URLs will still make sense while avoiding conflicts.

Remember that changing the slug of a page or collection will affect its URL, so make sure to update any internal or external links accordingly.

Additionally, if you're using the slug in your template pages or dynamic lists, you'll need to update those references as well.

After making the necessary changes, you should be able to update your page settings without encountering the error.