Fatally missing registry entries

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    I had a backup of a server I had a year ago and I wanted to play it again, so I did. I got all the mods but when I try to join it says ''Fatally missing registry entries''

    Any solution to this?

    Make sure that the EXACT same mods installed on both your PC and the server. It is not enough to simply have the same mods installed, they must also be installed in the exact same version. Likewise, the version of the mod loader (Fabric/Forge) must be identical.If you use a Modpack make sure you're running the same version as the server.