My minecraft keeps giving me a loading mods error.

[zarn_xv]

I tried to download the waystones mod and whenever i enter the game it gives me:

error Loading mods

1 error has occurred during loading

Mod file waystones-forge-1.21-21.0.1.jar needs language provider javafl.51 or above to load

we have found 50.0.20

I've tried every search i can think of but i still cant seem to find a solution. i don't have much experience with downloading mods on Minecraft java seen that I've only played with mods on Minecraft PE.

I've tried re-installing the mod several times and that has not worked. 

please please someone help me out 

[TileEntity]

You are using a build for Minecraft 1.21

Currently, you are using Minecraft 1.20.6

Use this build:

https://www.curseforge.com/minecraft/mc-mods/waystones/files/5421684

Also add Balm as dependency:

https://www.curseforge.com/minecraft/mc-mods/balm/files/5389054