Searched documents need login

Recently I noticed that one document in a category after a Joomla search (not smart) only could be openened via a a login (see attachment). I deleted the document and uploaded it again. The problem however still exists. Deleting the documents and the category and reinstalling them under a different category name avoids the problem, but renaming the category leads to the same problem again.
Then I opened the Edocman search module in the front end. The searched document can just be opened without any login window!
How could this be resolved as I just want one single search window?

Hi,
Please try to open Edocman Configuration -> Tab: Sef Router Settings and enable 2 configure options:
- Include Document ID
- Include Category ID
And then, please check the links to categories and documents again
Thanks
Dam

Problems solved, thank you so much.

You're welcome