Opening game shows "resource reload failed" popup on title screen

Crash Message:
The game crashed whilst unexpected error
Error: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_5944.setSampler(int, Object)" because "shaderinstance" is null

Game crashes while trying to use OptiFabric-v1.13.24 and OptiFine 1.19.4 HD U I4

Let me know if you need any more information

Are you trying to have both Optifabric and Optifine at the same time? The error log seems not to be connected to HorseStatsVanilla in any way. The setSampler method is not used by the mod.
If you need further help, send me the full log of the crash.
You can also try to install the newest FabricApi version.