What size is the USB drive you're copying too? Ive seen a similar error before and it was due to the destination drive being too small. You'll want to use a 16GB. There could also be a small chance that it could be an issue with one of the two usb drives you're using - may want to try a different one. Id be happy to help you troubleshoot further on the Discord channel Ive created - here's an invite - https://discord.gg/949sUdr