(Discord Bot Related Question) I make a mute command but when I run it, I get this "Cannot Read Property 'split' of undefined" - autocode

Question

I'm using autocode for this question, Every time I rerun the command there is always an error that said "Cannot Read Property 'split' of undefined" Here is the code below:
const event = context.params.event
const { guild_id, token, channel_id, member, author} = event;
const error = require('../../../helpers/error.js')
try {
if (!event?.mentions?.length) throw new Error(`You need to mention a user!`);
let emojis = await lib.utils.kv['#0.1.16'].get({key: `emojis`, defaultValue: {moderator: null, user: null, reason: null, channel: null, error: null, timeout: null, clock: null}});
let base = await lib.airtable.query['#1.0.0'].select({table: `Config`, where: [{'Guild__is': guild_id}]});
if (!base?.rows?.length) base = await lib.airtable.query['#1.0.0'].insert({table: `Config`, fieldsets: [{'Guild': guild_id}]});
let cNum = (await lib.airtable.query['#1.0.0'].max({table: `Cases`, where: [{'Guild__is': guild_id}], field: `Case`})).max.max + 1
let isAdmin = false, targetAdmin = false, reason = event.content.split(' ').slice(3).join(' ') || `No reason provided`
let guildInfo = await lib.discord.guilds['#0.2.4'].retrieve({guild_id});
let target = await lib.discord.guilds['#0.2.4'].members.retrieve({user_id: event.mentions[0].id, guild_id});
if (guildInfo.owner_id == author.id) isAdmin = true
if (guildInfo.owner_id == target.user.id) targetAdmin = true
if (member.roles.includes(base.rows[0].fields.Moderator)) isAdmin = true
if (target.roles.includes(base.rows[0].fields.Moderator)) targetAdmin = true
if (guildInfo.roles.filter(role => (role.permissions & (1 << 3)) === 1 << 3 && member.roles.includes(role.id))?.length) isAdmin = true
if (guildInfo.roles.filter(role => (role.permissions & (1 << 3)) === 1 << 3 && target.roles.includes(role.id))?.length) targetAdmin = true
if (!isAdmin)
return lib.discord.channels['#release'].messages.create({channel_id, content: `<:error:${emojis.error}> You don't have permission to use \`sm.mute\``});
if (targetAdmin)
return lib.discord.channels['#release'].messages.create({channel_id, content: `<:error:${emojis.error}> You can't mute a member who is mod/admin`});
let match = event.context.split(' ')[2].match(/(\d+)(s|m|h|d)/)
if (!match)
throw new Error(`Please provide a duration in days(\`d\`), hours(\`h\`), minutes(\`m\`) or seconds(\`s\`).`)
let secs = new Date().getSeconds()
let time = parseInt(match[1]), unit = match[2]
if (unit === 's') time *= 1
else if (unit === 'm') time *= 60
else if (unit === 'h') time *= 60 * 60
else if (unit === 'd') time *= 24 * 60 * 60
let until = `<t:${Math.floor(new Date().setSeconds(secs + time) / 1000)}>`
await lib.discord.guilds['#release'].members.timeout.update({user_id: target.user.id, guild_id, communication_disabled_until_seconds: time, reason});
await lib.discord.channels['#release'].messages.create({channel_id, content: `<:succes:${emojis.success}>**${target.user.username}** was muted for ${match[1]} ${match[2].replace('s', 'seconds').replace('d', 'days').replace('h', 'hours').replace('m', 'minutes')} | ${reason}`});
if (base.rows[0].fields.Logging) {
await lib.discord.channels['#release'].messages.create({
channel_id: base.rows[0].fields.Logging,
content: ``,
embeds: [{
type: 'rich',
color: 0xE72020,
description: `
<:user:${emojis.user}> | <#${target.user.id}> | ${target.user.username}#${target.user.discriminator}
<:moderator:${emojis.moderator}> | <#${author.id}> | ${author.username}#${author.discriminator}
<:reason:${emojis.reason}> | ${reason}
<:timeout:${emojis.timeout} | ${until.replace('>', ':R>')} | ${time}s`,
footer: {text: `Case Number: ${cNum}`},
author: {name: `${cNum} | Mute`, icon_url: target.user.avatar_url || 'https://cdn.discordapp.com/attachments/911294620439293993/965586325208195142/avatar.png'},
timestamp: new Date().toISOString(),
}],
});
}
await lib.airtable.query['#1.0.0'].insert({table: `Cases`,
fieldsets: [{
User: target.user.id,
Reason: reason,
Type: `Mute`,
Moderator: author.id,
Timestamp: `<t:${Math.floor(new Date().getTime() / 1000)}>`,
Case: cNum,
Guild: guild_id,
}],
});
} catch (e) {
await error.prefix(channel_id, e.message)
Help me! I need some help to fix this. Please explain this answer of how to fix "Cannot Read Property 'split' of undefined"