The shader is trying to use more VRAM than available. Fix: Lower your Render Quality to 0.8x in the shader settings. Also, reduce Minecraft's render distance to 12.
I tested out Sildur's Vibrant Lite Shaders, and I’m convinced this is the best balance of performance and beauty. In this video, we explore how the pack handles sunset lighting, water reflections, and interior shadows. Spoiler: It makes Minecraft look like a completely different game. Check the links below to download and try it yourself! sildurs vibrant lite shaders
Click and load into your world to see the transformation. Tips to Maximize FPS with Sildurs Lite The shader is trying to use more VRAM than available