This is a graphics related error that happens when something is wrong with either:
- Graphics drivers
- Screen resolution
- DirectX
To fix this issue try the following:
- Verify the integrity of the game files
- Reinstall the graphics drivers
- Ensure that you are using one of the following resolutions on your PC and in Rocket League
- 1366x768
- 1920x1080
- Reinstall DirectX
- Force settings back to factory to default
If you are still receiving the same D3D9 error message after completing all of these steps, please submit a ticket with us. Be sure to attach your DxDiag and Msinfo files to your ticket.