How do I send a message to the client?

[ashen ivy]

The mod below does not run on Fabric. Is there anyone who knows how to resolve this issue?
It runs normally in debugging mode.

error:

Caused by: java.lang.ClassNotFoundException: net.minecraft.client.MinecraftClient
java.lang.ClassNotFoundException: net.minecraft.text.Text

mod:

package com.kimryungyo.fabrics.client;

import net.fabricmc.api.ClientModInitializer;
import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
import net.fabricmc.api.Environment;
import net.fabricmc.api.EnvType;
import net.minecraft.client.network.ClientPlayerEntity;
import net.minecraft.text.Text;

@Environment(EnvType.CLIENT)
public class FabricsClient implements ClientModInitializer {
    private boolean hasJoinedWorld = false;

    @Override
    public void onInitializeClient() {
        ClientTickEvents.END_CLIENT_TICK.register(client -> {
            if (client.world != null && client.player != null && !hasJoinedWorld) {
                hasJoinedWorld = true;

                ClientPlayerEntity player = client.player;
                String uuid = player.getUuidAsString();
                String nickname = player.getName().getString();

                player.sendMessage(Text.literal("§a[ Client Info ] UUID: " + uuid), false);
                player.sendMessage(Text.literal("§a[ Client Info ] NICKNAME: " + nickname), false);

            } else if (client.world == null) {
                hasJoinedWorld = false;
            }
        });
    }
}

[languid goblet]

do you use split sources?

[ashen ivy]

sorry, I can't understand your question.
This is my project structure.

[languid goblet]

you are using split sources but where you've written the code is also correct

when are you getting the error?

oh nvm you said it works in your IDE

how did you make the .jar file?

[ashen ivy]

I added the following content to build.gradle and clicked the jar build button in the Gradle tab. I followed the steps in this post (https://discord.com/channels/507304429255393322/1264412816471883859), and it runs now. However, the message still doesn't show up.. 😭

tasks.jar {
    archiveFileName = 'FabricTests.jar'
    destinationDirectory = file('C:\\Users\\ROOT\\AppData\\Roaming\\.minecraft\\mods')
}

[orchid kindle]

did you run jar or build?

[ashen ivy]

this

Then I used the non sources file in build/libs/

[orchid kindle]

!!export

[twilit geyser]

Exporting your mod as a JAR: run in a terminal from the same directory as the mod project directory ./gradlew build on GNU/Linux and Mac, or gradlew build on Windows. Alternatively, in IntelliJ IDEA, open the Gradle tab on the right and execute build under tasks. The JARs should appear in ${projectDir}/build/libs. Use the one with the shortest name outside development.