If you get this error after updating to the latest version of ark you need to follow the instructions below
Go to your game panel.
Select "Steam Workshop (Installed)"
Click the "Reinstall All" button, this will delete and then install all the latest versions of the mods your server uses.
If Method 1 has not worked, it usually means that one or more of your mods are now incompatible with the latest ark version. To resolve this remove mods 1 by 1 from your config file until you are able to join (Take a backup of your world first) Once you can join put back all the mod numbers except the last one you removed.
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