Summary: This error generally occurs if there is a problem with the permissions.
Solution:
I. If the document is saved on a network drive.
- Move the document to the desktop.
- Open the document in QuarkXPress and make changes to it.
- Save it back to desktop.
II. Thumbnail drag.
Perform thumbnail drag of the document to save current changes.
https://support.quark.com/solution/articles/19000056068-how-to-perform-a-thumbnail-drag-/en
III. Create a folder on the desktop and save the document in the folder. Also, give full read & write permissions to this folder.
IV. Make sure there are no special characters in the file name.