What plugin did you install? Did you check the server log yet on why the specific plugin doesn't work?
Posts by Andreas
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Problem solved.
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Wish granted, but inflation will make your money worthless.
I wish I never had to sleep.
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https://github.com/drtshock/Essentials/wiki
You additionally have to add essentials.gamemode.survival for survival mode or just use essentials.gamemode.all for all game modes. essentials.gamemode is still needed to generally be able to use the command.
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Unfortunately, it's not possible to download them yet. Probably this will be possible in future though.
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Denied
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If you download a world you just download the overworld, The Nether and The End are not included in the download.
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Unfortunately, it's not possible to download any schematic files at the moment.
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Seems like your server takes too much time to start. Download and save your world to your computer if you still need it and reinstall your server. Eventually, try to start it again.
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We only accept plugins from DevBukkit and SpigotMC.
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Check the server console log for more detailed error information on why the plugins don't work.
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It relies on a static IP address which is not really available at Aternos.

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No. Your server only stays online as long as at least one player is online too.
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Added
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Can't be added since it's only available through an external site.