I am using a version of 1.13.2 Optifine HD Ultra E7
And wanted to try out some shaderpacks. I tried SEUS and Sildurs Vibrant Shaders.

I tried modding my game, it used to work, but now. Whenever I try to turn them on in game.
The screen starts flashing really fastly grey and the shaders don't work and starts causing lag. Once I turn it off and check my chat, it says: " OpenGL Error: 1282 (Invalid operation) "