Problem with Aspect Ratio

In Resolve 14 I could render with the 2.35 aspect ratio by rendering with 1920x817 pixels.
In Resolve 15 I get an error "Recording failed with Error : Failed to encode the video frame."
How i can get my aspect ratio now, eithout rendering an 16:9 file?
Any solution?
THX
Greetings
Mark
In Resolve 15 I get an error "Recording failed with Error : Failed to encode the video frame."
How i can get my aspect ratio now, eithout rendering an 16:9 file?
Any solution?
THX
Greetings
Mark