The content type “Document Collection Folder” at “…” is sealed

Question

It is about 2 days when myself as full control and my users try to upload a document to SharePoint 2013 assets library this error popup for them

The content type “Document Collection Folder” at “…” is sealed.

I searched and I activated the "Video and Rich Media" feature in site collection level but it didn't change.

It is very important and critical, so I appreciate if anyone can help regarding this issue.

Answer 1

I reached the answer my self and after activating "Rich Video" and "Doc Set " feature and recreating the Library it got solve. Thanks

Answer 2

I confirm you must:

1. Delete the library "Asset Library".
2. Activate the 2 Site Collection features: Document Sets, Video and Rich Media.
3. Create a new "Asset Library".
4. Re-upload files.