I need help exporting a project from Premiere Pro (Error code 3 Selector 9)

For some reason, this one project doesn't want to export. I tried with my other projects and they export just fine. This is the error I get when I put the job into Media Encoder:

- Encoding Time: 00:00:01
01/02/2023 01:33:06 PM : Encoding Failed
------------------------------------------------------------
A low-level exception occurred in: H.264 (Exporter:9)

Export Error
Error compiling movie.

Export Error

A low-level exception occurred.

Writing with exporter: H.264
Writing to file: D:\Unreal Projects\Builds\Saved\MovieRender\Sequence 01_Sub_01.mp4
Around timecode: 00:00:00:00
Component: H.264 of type Exporter
Selector: 9
Error code: 3

Can someone help me?