The error is VERY easily solvable. The version of the server-side pack was incorrect, as it was on 1.1.1c instead of 1.1.2. All you need to do is either update the pack or change the version number of the pack as it was to the actual version you were running, so people know to downgrade their clients. Please bring this back!
Posts by Fireball248
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Same here - client is 1.1.2 as well.