Cannot read property 'split' of undefined

```
module.exports = {
name: 'setlanguage',
aliases: ['setlang', 'languageset', 'setlg'],
description: 'a',
permissions: [],
cooldown: 5,
execute(message, client) {
const langages = ["english", "french"]
const newLanguageName = message.content.split(" ")[1];
// If no new language is specified, returns an error message
if(!newLanguageName){
return message.channel.send(language("MISSING_LANGUAGE"));
}
if(!langages.includes(newLanguageName)){
return message.channel.send(language("LANGUAGE_NO_EXIST"));
}
// Update our json database
guildLanguages[message.guild.id] = newLanguageName;
fs.writeFileSync("./guilds-language.json", JSON.stringify(guildLanguages), "utf-8");
// Gets the new language
const newLanguage = require(`./languages/${newLanguageName}`);
// Send a success message
message.channel.send(newLanguage("LANGUAGE_UPDATED"));
}
}
```

const newLanguageName = message.content.split(" ")[1];
^

TypeError: Cannot read property 'split' of undefined