Error code -50?

Anyone know what this error code means? I am trying to move a video file from my SSD to a network drive. I've managed to do it for several other videos, but this video is the only one that isn't transferring.

I did find this which describes the error code, but I don't know what it means. The box that pops up says "The operation can't be completed because an unexpected error occured (error code -50).