[Laura Hewett]

I know this reply is probably a tad late, but for anyone else having this problem:

Try changing the output destination for your render.

I was having the same error message popping up when trying to render something to the same hard drive the project was saved to. So I tried saving it to the Desktop instead and it worked fine.

I assume this is down to my hard drive, but it isn’t causing me any other problems at the moment so I simply keep a folder on the Desktop called Renders and keep making sure everything is backed up as it should be!