Make sure you are using the mod also on your client.
Posts by Drachionix
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For help regarding Aternos, we recommend you to visit our support center.
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Adding plugins to your modded server is only possible with cauldron or sponge. Cauldron has been discontinued and sponge is still in beta and not that popular yet. Also, we only add modpacks in their official composition, we won't run a server with cauldron when it officially comes with forge.
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Denied. External site.
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Already denied.
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Ja wow.
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Read the error log.
Type '/fml confirm' (without quotes) in the console to start the server -
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We will try to update as soon as possible. Usually, we update all mods and modpacks every week around the weekend. If you want to see all updates, you can have a look at our #updates channel on our Discord server: https://chat.aternos.org

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You can find many reasons for that here on the forums. Please use the search feature.
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Make sure you use bukkit or spigot.
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That's a problem of your World and has nothing to do with Aternos.
Due to limited resources the RandomTickSpeed 10000000 your server crashed and maybe the world now isn't working properly -
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You could try to use a different Browser or just wait.
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We will try to update as soon as possible. Usually, we update all mods and modpacks every week around the weekend. If you want to see all updates, you can have a look at our #updates channel on our Discord server: https://chat.aternos.org

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