These "How to run a FTB Modpack on your Minecraft Server" steps are for Multicraft services. Newer Minecraft servers use a different panel, and the up-to-date guide is: How to install or update a Minecraft modpack.
To run a FTB Modpack on your Minecraft server, you have to:
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Login to your Multicraft and stop your server.
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Delete your old world, and any other mods that you had installed.
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Select the FTB modpack you want to play from the JAR dropdown.
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Start the server and enjoy!
