TypeError: interaction.options.getSubcommand is not a function - discord.js

Question

I have made a all-in-one moderation bot by compiling certain codes. Recently, I was adding Ticket-System to my bot and it showed me this error. Although, I tried all the fixes I could find on the internet but still couldn't solve it.
Here is my code -->
ticket-config.js
const { Util, MessageEmbed } = require('discord.js');
const configOptions = require('../../configOptions');
module.exports = {
name: "ticketconfig",
description: "Configuration ticket system.",
options: configOptions,
permission: "ADMINISTRATOR",
run: async(interaction, client) => {
const replyMessage = {
content: "Config has been set!"
}
if (interaction.options.getSubcommand() === 'message') {
const message = interaction.options.getString('message');
const content = interaction.options.getString('content') || null;
let data = await client.db.get('config', interaction.guild.id);
if (!data) data = {};
data.message = message;
data.content = content;
await client.db.set('config', interaction.guild.id, data);
return interaction.reply(replyMessage)
}
configOptions.js
module.exports = [
{
name: "message",
description: "Configuration your ticket message",
type: 1,
options: [
{
name: "message",
description: "The message to sent in ticket",
type: 3,
required: true
},
{
name: "content",
description: "content will be appeared above embed message, use /variables command to see all available variables.",
type: 3
}
]
},
./handler/index.js
module.exports = async (client) => {
const eventFiles = await globPromise(`${process.cwd()}/events/*.js`);
eventFiles.map((value) => require(value));
const slashCommands = await globPromise(
`${process.cwd()}/SlashCommands/*/*.js`
);
const arrayOfSlashCommands = [];
slashCommands.map((value) => {
const file = require(value);
if (!file?.name) return;
client.slashCommands.set(file.name, file);
if (["MESSAGE", "USER"].includes(file.type)) delete file.description;
arrayOfSlashCommands.push(file);
});
client.on("ready", async () => {
await client.application.commands.set(arrayOfSlashCommands);
});