[Enhancement] Send error messages in case of incorrect channel IDs or insufficient permissions

[Loved-Ubuntu]

Checks

• I confirm that I have searched for existing issues / pull requests before reporting to avoid duplicate reporting.
• I confirm that I followed the MCDC Docs and read the Changelog, but this problem still exists.
• I confirm that I noted that if I don't follow the instructions, the issue may be closed directly.

Minecraft Version

1.20.1

MC-Discord-Chat Version

2.2.2

Description

Added the jar to the mods folder. Configured the bot like on the page and started the server. As you see the mod says everything is correct and it's finished loading and then it dies.

To Reproduce

Start the server with an channel ID that is wrong.

Log

[17:31:20] [main/INFO]: -----------------------------------------
[17:31:20] [main/INFO]: MC-Discord-Chat (MCDC) 2.2.2
[17:31:20] [main/INFO]: By Xujiayao
[17:31:20] [main/INFO]:
[17:31:20] [main/INFO]: More information + Docs:
[17:31:20] [main/INFO]: https://blog.xujiayao.top/posts/4ba0a17a/
[17:31:20] [main/INFO]: -----------------------------------------
[17:31:20] [main/INFO]: Login Successful!
[17:31:21] [JDA MainWS-ReadThread/INFO]: Connected to WebSocket
[17:31:21] [JDA MainWS-ReadThread/INFO]: Finished Loading!
[17:31:21] [main/ERROR]: java.lang.NullPointerException
        at java.base/java.util.Objects.requireNonNull(Objects.java:209)
        at top.xujiayao.mcdiscordchat.Main.onInitializeServer(Main.java:109)
        at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:47)
        at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke(EntrypointUtils.java:35)
        at net.fabricmc.loader.impl.game.minecraft.Hooks.startServer(Hooks.java:63)
        at net.minecraft.server.Main.main(Main.java:112)
        at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468)
        at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
        at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23)
        at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69)

Config

{
  "generic": {
    "language": "en_us",
    "botToken": "<token>",
    "botPlayingStatus": "Cappuccino SMP: (%onlinePlayerCount%/%maxPlayerCount%)",
    "botListeningStatus": "Cappuccino SMP",
    "useWebhook": true,
    "channelId": "11577150709864981681",
    "consoleLogChannelId": "",
    "updateNotificationChannelId": "",
    "useUuidInsteadOfName": true,
    "avatarApi": "https://mc-heads.net/avatar/%player%.png",
    "broadcastPlayerCommandExecution": true,
    "broadcastSlashCommandExecution": true,
    "announceServerStartStop": true,
    "announcePlayerJoinLeave": true,
    "announceDeathMessages": true,
    "announceAdvancements": true,
    "broadcastChatMessages": true,
    "formatChatMessages": true,
    "allowedMentions": [
      "everyone",
      "users",
      "roles"
    ],
    "useServerNickname": true,
    "discordNewlineLimit": 3,
    "announceHighMspt": true,
    "msptCheckInterval": 5000,
    "msptLimit": 50,
    "whitelistRequiresAdmin": true,
    "notifyUpdates": true,
    "mentionAdminsForUpdates": true,
    "updateChannelTopic": true,
    "channelTopicUpdateInterval": 600000,
    "shutdownImmediately": false,
    "excludedCommands": [
      "/msg",
      "/tell",
      "/tellraw",
      "/w"
    ],
    "adminsIds": []
  },
  "multiServer": {
    "enable": false,
    "host": "127.0.0.1",
    "port": 5000,
    "name": "SMP",
    "botIds": []
  },
  "customMessage": {
    "unformattedResponseMessage": "",
    "unformattedChatMessage": "",
    "unformattedOtherMessage": "",
    "unformattedCommandNotice": "",
    "formattedResponseMessage": "",
    "formattedChatMessage": "",
    "formattedOtherMessage": "",
    "formattedCommandNotice": "",
    "messageWithoutWebhook": "",
    "messageWithoutWebhookForMultiServer": "",
    "serverStarted": "",
    "serverStopped": "",
    "joinServer": "",
    "leftServer": "",
    "deathMessage": "",
    "advancementTask": "",
    "advancementGoal": "",
    "advancementChallenge": "",
    "highMspt": "",
    "offlineChannelTopic": "",
    "onlineChannelTopic": "",
    "onlineChannelTopicForMultiServer": ""
  },
  "latestVersion": "2.2.1",
  "latestCheckTime": 1695791055673
}

[Xujiayao]

You may use the latest build.