If you are receiving this message then it is possible that a temporary files has been corrupted
You will need to delete the Digital_Matter_Embedded folder.
The folder is usually located in…
C:\Users\<user>\AppData\Local\Digital_Matter_Embedded
<user> above will be the name that you have logged in with.
Tip: (You can serach your PC for the folder: "Digital_Matter_Embedded" )
Please note that the AppData folder is a hidden folder, so you would have to make sure hidden folders are being shown. (see how to show hidden folders)
Please restart the sync application once this has been completed.