i cant load shaders in 1.20.1 it sais toreport the issue to developers and idk how to do that

it started fine but when i got a new shader that my friend sent me asking to try it and that it is good but when i tried it with some adjustments the shaders stoped working and i got confused and i didnt know if it was the shader or the mod/iris so i tried allot more shaders and i realised that it wass iris that broke idk how but now i cant fix it how do i fix it