: Right-click the game > Properties > Installed Files > Verify integrity of game files .
If your hardware struggles with DirectX 12 or certain shader effects, switching to a more stable version can help. errgfxd3dshader1 work
(Windows 10/11) In the same Compatibility tab, check: : Right-click the game > Properties > Installed
: Corrupted temporary shader files can cause "shader1" or "D3D" errors. Navigate to your local AppData folder (usually Local\Rockstar Games\Red Dead Redemption 2\Settings Delete files starting with Switch Graphics API : If your game settings allow it, try switching from DirectX 12 try switching from DirectX 12