If a permissions error such as this occurs, then the first thing that might come to mind is to use Disk Utility's Permissions Fix routine. If this happens, then it could be because of an improper permissions setup with the Dropbox configuration files in your account, or with the files currently being copied. Dropbox can sometimes give you errors, saying that it cannot transfer something because it does not have permission to access some of the files being copied.
Dropbox is one of the more popular cloud-based syncing and storage tools, and offers Mac users a convenient way to transfer files from one system to another, or share files with colleagues.
