I know it's probably a bit late for you mate, but for anyone else with the problem the solution is pretty simple,.
Example Location: C:\users\user\documents\briefcase
(Briefcase is replaced by the name of your briefcase)
If your location is like this: c:\users\john smith\documents\briefcase
You will need to move the briefcase to another location which does not have spaces in it, and if necessary rename your briefcase so it is only one word.
Now create a New Folder and rename it to new and drag the briefcase into it
New Example: C:\Users\User\Documents\New\Briefcase
Now hold windows+R (Run...)
Type cmd
Click Ok
Type the following command:
robocopy c:\users\user\documents\new\briefcase\ c:\users\user\documents\new\ *.* /E /XD c:\users\user\documents\new\ /move
This will move the contents of your briefcase to the new folder you created.