The file cannot be moved until released by the application that is using it or there is sufficient space on the target disk or media.
Select a different disk drive or media that has sufficient free space.
Select the application that is currently using the file or folder and save the file or folder so that your second application can access it.
If you recently had an application crash, it may have left a lock on a file. A system reboot may be necessary to release the file for other applications to access and/or modify the file.
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