Render Error: -1609629695 due to Levels Effects on one of the layers.
I could not render my work in After Effects or in Media Encoder. I get the error message:
Export Error
Error compiling movie.
Render Error
Render returned error.
Writing with exporter: H.264
Writing file type: H264
Around timecode: 00:00:00:08
Rendering at offset: 0,000 seconds
Component: H.264 of type Exporter
Selector: 9
Error code: -1609629695
So I started to disable layer by layer one by one and render again until I narrowed down the problem - This was due to layer that had "Levels" effect. Once I turned off the Effect everything worked fine. Your welcome.

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Hi Justas,
Thanks for reporting this issue. Would you be able to provide the project file you were working with? We have an investigation in progress for a similar issue in AME, but we would need to test your project file to confirm if you are experiencing the same issue.
This issue may also relate to your computer's specs: would you please post your OS version, RAM amount, etc?
Thanks very much for any additional information,
- John, After Effects Engineering Team