Looks like you don't have the exact same mods installed on your computer as on the server.
Also the versions of the mods must match.
I tried and it still doesn't work
Posts by ptyp
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Also here are the logs: https://mclo.gs/SuxZz0M
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I set up all of the mods and addons. And I still can't fix it
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So I found this modpack online and I really want to play it with my friends. Can you please add it mods?