In the bot tab of Discord's developer portal, there are 2 privileged gateway intents. These intents are classed as privileged due to the sensitive nature of the data. You can find out more about them here.
Zeltux needs access to both Server Members Intent and Presence Intent.
Head to Discords' Developer Portal and go into your bot.
Go to the bot tab.
Scroll to Privileged Gateway Intents.
Enable both intents.
On October 7, 2020 Discord will make intents for Discord bots mandatory, with this privileged gateway intents must be defined to access certain features.
Enabling the Guild Members intent will allow us to get access to when members join and leave your guild, allowing Zeltux features like autorole, welcome messages, leave message and more...
Enabling the Presence intent will give Zeltux access to users status' for commands like
You can find out more about intents here.