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Important: If you are seeing this error it is likely you are either running an active Firewall protection program or an Anti-virus program that is interfering with the upload process, or the file is open and in use by another program.
Please check the file is not in use. You may also need to review your software settings or disable them when uploading.
You can also try to upload using our alternative Flash-based Uploader, or with the Wizard tool.
