put custom tree feature on a structure

Hello, for more context :
1.21.7
Trying to make a floating island, placing it as a structure, where i will add a custom biome, where i will add features such as trees with specific shape and loot table that will only spawn on the grass blocks of the island.


But i had a problem, the game won't launch anymore and it says this in the log, i changed the file a lot of times but it seems like the error keeps being because of the same reason, place_feature, if someone can go check what is the problem please, i can't grasp why it's not working.


Thank you 🙏


THE LOG  :


03:28:12.306
Failed to load level data or datapacks, can't proceed with server load
java.util.concurrent.ExecutionException: net.minecraft.class_148: Registry Loading
    at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
    at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073)
    at knot//net.minecraft.class_7196.method_45694(class_7196.java:185)
    at knot//net.minecraft.class_7196.method_54610(class_7196.java:138)
    at knot//net.minecraft.class_7196.method_57780(class_7196.java:324)
    at knot//net.minecraft.class_7196.method_57781(class_7196.java:314)
    at knot//net.minecraft.class_7196.method_57782(class_7196.java:279)
    at knot//net.minecraft.class_7196.method_57784(class_7196.java:245)
    at knot//net.minecraft.class_528$class_4272.method_20164(class_528.java:432)
    at knot//net.minecraft.class_528$class_4272.method_25402(class_528.java:409)
    at knot//net.minecraft.class_4069.method_25402(class_4069.java:43)
    at knot//net.minecraft.class_9017.method_25402(class_9017.java:57)
    at knot//net.minecraft.class_4069.method_25402(class_4069.java:43)
    at knot//net.minecraft.class_312.mixinextras$bridge$method_25402$38(class_312.java)
    at knot//net.minecraft.class_312.wrapOperation$zno000$fabric-screen-api-v1$invokeMouseClickedEvents(class_312.java:545)
    at knot//net.minecraft.class_312.method_1601(class_312.java:120)
    at knot//net.minecraft.class_312.method_22686(class_312.java:226)
    at knot//net.minecraft.class_1255.execute(class_1255.java:110)
    at knot//net.minecraft.class_312.method_22684(class_312.java:226)
    at knot//org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:43)
    at knot//org.lwjgl.system.JNI.invokeV(Native Method)
    at knot//org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3509)
    at knot//com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(RenderSystem.java:179)
    at knot//net.minecraft.class_310.method_1523(class_310.java:1383)
    at knot//net.minecraft.class_310.method_1514(class_310.java:947)
    at knot//net.minecraft.client.main.Main.main(Main.java:265)
    at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
    at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
    at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Caused by: net.minecraft.class_148: Registry Loading
    at knot//net.minecraft.class_7655.method_62810(class_7655.java:296)
    at knot//net.minecraft.class_7655.method_45126(class_7655.java:261)
    at knot//net.minecraft.class_7655.method_45121(class_7655.java:228)
    at knot//net.minecraft.class_7655.mixinextras$bridge$method_45121$37(class_7655.java)
    at knot//net.minecraft.class_7655.wrapOperation$zkc000$fabric-registry-sync-v0$wrapIsServerCall(class_7655.java:1055)
    at knot//net.minecraft.class_7655.method_56515(class_7655.java:193)
    at knot//net.minecraft.class_7237.method_42098(class_7237.java:41)
    at knot//net.minecraft.class_7196.method_45694(class_7196.java:183)
    ... 26 more
Caused by: java.lang.IllegalStateException: Failed to load registries due to errors
    at knot//net.minecraft.class_7655.method_62810(class_7655.java:280)
    ... 33 more


THE FILE :
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