Export Errors/Can't change video renderer

Ok ... some suggestions.

Your rig is simply not built for long-GOP/H.264-5 exports. First. The "F" in the CPU name means it doesn't have the iGPU hardware internally, built for working with Nvidia's QuickSync long-GOP processing process. That's one issue.

Next, you might be hitting some issues inside Premiere with order of processing. Where one step is in process while the next starts in another bit of hardware, and the two processes mess each other up. This can be handled often by say doing part of the work, nesting the clip, then doing the next major bit.

If you have multiple heavy effects like Warp and Lumetri, I never suggest processing both on a clip. Ever. Warp is the heaviest effect in Premiere, even harder on hardware than Neat video noise reducer. Lumetri can be kinda close.

I'll apply Warp, and when the clip plays as I want, I do a full render & replace operation to (normally) ProRes422, so Warp is done and gone.

Then I can apply whatever effects I want and it will  all process fine in the export.

Some people, with only a few short bits of Warp, simply apply Warp, nest, then do their other stuff. That might help.

Another thing due to the long-GOP thing with your CPU, is exporting from Premiere in ProRes422 or a DNx variant, then taking that into say Handbrake or ShutterEncoder, maybe even on another machine, and creating the long-GOP file there.