Happens every time I try and use shaders with replay mod. I'm using:
1. forge 1.8.9-forge1.8.9- 11.15.1.2318
2. Optifine_1.8.9_U_I7 (I've tried others, same problem)
3. replaymod-1.8.9-2.1.4
Just found a solution, if you have 1.7 animations mod then remove it from any and all subfolders (kinda doesn't make sense because 1.12.2 had the same problem even when just 2 mods were present) (even if it isn't in your specified mod folder) and install the latest version and that should fix the problem.