IO Error Message When Opening GH File: "An entry with the same key already exists"

Hi all,

I recently acquired a full commercial licence of Rhino 7, having previously been using the trial version. I tried to open a file I had been working on from the previous day and was met with the following IO error message:

Unfortunately the project is NDA, so I am unable to share the file.

Is there any way to get this file back from the void?

Thanks, JM