Adobe Premiere ImportMPEG Error While rendering (Selector:47 Error99)

Try Step 2M below.

Unofficial Premiere Pro Troubleshooting Guide

It is one clip exactly 18 min 12 sec and 14 frames (29.97 non-drop).

I have no tried setting the in and out shorter, I did however cut off that last frame and it didn't work. I have 3 clips total that this is happening, I've exported small cuts of it in another project and rendered without issue.

I'll go ahead and test what you have suggested, I don't expect much of a change.

I have 100gb+ space free to render to.

To explain the issue, I had taken original clips and started picking them apart to lay into a promo video. After the promo editing was done, I wanted to edit the original interviews in terms of color. It was my mistake to not create a sequence from the interview clips, that way I could edit the color of the original and it be applied across the board. I am at the point where I am treating it like a proxy and I added color and will overwrite the source clip with these renders.

So, what's happening at timecode 00:18:12:14?

Check around that area. Maybe there's an effect or transition that isn't working, and you need to remove & redo. You might need to clear the media cache/cache database also.

Neil