FreeFileSync Forum

It seems you will also get this error in the case where you have only read access to one of the directories being sync'ed.

Check that you can write to the directory in which the error is reported (e.g. create a new file there then delete it if that was successful).

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I had the same event and just resolved it.
I think there is a folder or file with the same name in the source folder.

In Jim's case, there may be the following folders or files in "\\office\Users\James\Documents\".
Assumption 1: "My Documents.ffs_gui" and "my documents.ffs_gui ...