You are getting this error because the files are secured or protected.
- To resolve this problem you need to enable the ACL (Access Control List) permission, Create personal folders/views, as well as the Create shared folders/views permission. You may also right-click the folder and choose Remove Folder.
- There is one more way to fix this problem. You need to turn on the Full Access Administrator option in Domino ACL. You may do this by: Right click the desired database > Click the ACL (Access Control List) > Add your name over there as a person and a manager. You'll be done.
Hope this information will be helpful.