Problem "This server has mods that require FML/Forge to be installed on the client."

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Injiro

New Member
Nov 23, 2020
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I'm running a multicraft server with my friends and we are trying to run FTB Revelations 3.2.0 1.12.2 and it keeps giving us that error code. I've been trying to figure it out with google and either I'm dumb or simply can't find the answer for my life.
I tried to run Minecraft in both live (first image)
1606176019965.png

and in version 1.12.2
1606175951465.png

which is shows but i still end up getting the error message (like in the title)
any help or answers would be greatly appreciated