Could you please submit an issue from within Hype, using Help > Report an Issue? When you do so, please also include your document in the Issue Reporter’s Attachments section, and ensure that the “Send logs, preferences, and system information” checkbox is checked.
This will give us a more complete picture of what’s going wrong.
One other quick note: Restarting your computer might resolve this issue, since it clears out temporary files which might themselves be triggering permission errors relating to this problem.