MuseScore3 crashes when closing

When I close my score, I get the following error...

Writing Workspace File
C:/Program Files/MuseScore 3/workspaces/Advanced.workspace
failed:

My score is actually stored in folder \STARFISH\RedirectedFolders\Gary\My Documents\Music (Sheet, etc.)\Sax & Clarinet\Other\MuseScore

I am using OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.0.2.5312, revision: 8ca4d2c

I would be most grateful if you could help me with this problem.

Many thanks,

Gary Cooper