It's typically in .minecraft/logs/latest.log on your computer.
You can just upload that file to your post here.
Posts by Roman
The Aternos forums are now deprecated
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.
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Which software and version is installed on your server?
Please share the server log using the share button on the log page.
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java edition
Please answer both questions
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Try deleting the Grand Gaia_the_end world on the worlds page.
Make sure to have backup
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Try removing twilight forest
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This is the forum for Aternos. Please contact the exaroton support
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Has your server cracked enabled?
Did you buy Minecraft?
Was the world ever used on SP before?
What is your InGame Name?
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Share the log with the correct version installed.
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https://aternos.org/addons/a/curseforge/biomes-o-plenty
Make sure that your server is running on Forge.
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There's no specific minimum on that.
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Does the problem persist with a new world?
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Try removing the mod Zombie Extreme
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We only show you that versions that are compatible with your installed server version.
You probably use forge 1.12.2.
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You installed the mod collective made for MC 1.16.5 on your 1.16.4 server
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You can use a yaml validator to valide the syntax of your file and find issues: http://www.yamllint.com/
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Your modifications of the PowerRanks configuration file are invalid.
The invalid change should be around line 48/49 of the config file.
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What error message do you get when you try to join your server?
Do you try to connect from PE or Java Edition?
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You probably don't have the same mods / mod-versions installed on your computer as the server.