C:\Users\Gebruiker\Desktop\Discordbots\index.js:30
channel.send(`Welkom ${member}! Dit is de officieële discordserver van veiling The City.`);
        ^

TypeError: channel.send is not a function
    at Client.<anonymous> (C:\Users\Gebruiker\Desktop\Discordbots\index.js:30:9)
    at Client.emit (events.js:203:13)
    at Guild._addMember (C:\Users\Gebruiker\Desktop\Discordbots\node_modules\discord.js\src\structures\Guild.js:1298:19)
    at GuildMemberAddHandler.handle (C:\Users\Gebruiker\Desktop\Discordbots\node_modules\discord.js\src\client\websocket\packets\handlers\GuildMemberAdd.js:12:13)
    at WebSocketPacketManager.handle (C:\Users\Gebruiker\Desktop\Discordbots\node_modules\discord.js\src\client\websocket\packets\WebSocketPacketManager.js:105:65)
    at WebSocketConnection.onPacket (C:\Users\Gebruiker\Desktop\Discordbots\node_modules\discord.js\src\client\websocket\WebSocketConnection.js:333:35)
    at WebSocketConnection.onMessage (C:\Users\Gebruiker\Desktop\Discordbots\node_modules\discord.js\src\client\websocket\WebSocketConnection.js:296:17)
    at WebSocket.onMessage (C:\Users\Gebruiker\Desktop\Discordbots\node_modules\ws\lib\event-target.js:120:16)
    at WebSocket.emit (events.js:203:13)
    at Receiver.receiverOnMessage (C:\Users\Gebruiker\Desktop\Discordbots\node_modules\ws\lib\websocket.js:789:20)
[nodemon] app crashed - waiting for file changes before starting...