IMovie Error: RenderFrameAt returned: 4 for absolute frame: 12065

Hi,

Not entirely sure but I believe that the error means that there is some conflict somewhere, either in a specific frame in the project or somewhere on the computer. Take a look at this thread and some of the suggestions there:

https://discussions.apple.com/thread/251754895?page=1

The poster in the above thread solved it by simply rebooting the Mac.

-- Rich

Here's a fix for this issue that worked for me:

The error is essentially saying there's something wrong with frame 12,065 of your project; it's most likely a dropped (black) frame. Go to that specific frame in your project and just edit it out. Use a frame-to-time converter to know which specific time it is if you're using a time code instead of frames.

https://www.zapstudio.net/framecalc/

I know it's been about 20 days from when you posted it, but hopefully this will help in the future should that issue arise again.