The issue has been fixed with Apple’s MacOS High Sierra 10.13.4 Beta (17E139).
You can try out the fix by updating your machine to the beta update from Apple.
Let us know if the issue is fixed for you after aforementioned High Sierra beta update.
An error occurred while saving the commentJennifer commented
We're having the same issue in my office and changing to AFP server address did not resolve the issue. Not being able to package the file is a big inconvenience, not to mention saving to the desktop and packaging from there increases the chance of errors. Hopefully a real resolution is developed soon.