: Go to Settings > Windows Update and check for available patches, as these often include critical DirectX updates. 2. Disable GPU and CPU Overclocking

Before trying fixes, it helps to understand the "why." This error usually stems from:

From analyzing similar shader errors and user reports, errgfxd3dshader1 usually appears due to:

Technical Incident Report: ERR_GFX_D3D_SHADER_1 Error Analysis

Test the game again. If fixed, slowly reapply overclock but reduce memory clock first — shaders are sensitive to VRAM stability.