“fn 不是函数” discord.js

Question

recently I'm having some problems in Discord.js. I'm not an exper so forgive me if I ask some stuid question. This is the code:

let rUser = message.guild.member(message.mentions.users.first() || message.guild.members.cache.get(args[0]));
if(!rUser) return message.channel.send('Couldn\'t find this user!');
let rReason = args.join(' ').slice(22);
if(!rReason) return message.channel.send('Insert a reason');

let reportEmbed = new Discord.MessageEmbed()
.setDescription('**User report**')
.addField('Reported user:', `${rUser.displayName} <${rUser.id}>`)
.addField(`Reason:`, `${rReason}`)
.addField('Reported by:', message.author.username)
.setColor(0xf52c2c);

let rChannel = client.channels.cache.get(707956253040574525)
if(!rChannel) return message.channel.send('Not valid report channel');

rChannel.send(reportEmbed)

It gives me this error: TypeError: Cannot read property 'send' of undefined

I'm using: node.js (6.14.4), discord.js (12.2.0), ms (2.1.2)

EDIT

Resolved updating node.js and changing

let rChannel = message.guild.channels.cache.find(`name`, 'reports')

with

let rChannel = message.guild.channels.cache.find(channel => channel.name === 'reports')

where "reports" is just the name of the channel where the bot will send the message

Answer 1

You need to update Node.js.

Discord.js v12 requires Node.js 12.0.0+.

To update Node.js run the following in your terminal:

npm install -g npm stable

npm install -g node