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Just a note, I'm currently attempting to join the server using a different account on the same system, as a friend of mine is able to join the server without a problem.
(Update) The second account was also unable to join the server with the error message "Fatally Missing Blocks and Items" Really confused and kind of upset with this development.
So for the past day or so I have been unable to join my server because due to an error in java.lang.RuntimeException: Invalid ID 1 and I have exactly 0 ideas as to how to fix it. I might know what it occured, as my modpack updated today and it may have deleted player data that was crucial to logging on to the server with my inventory intact. Fixing it, however, is a different beast that I don't know how to overcome. If someone could help me out that'd be great!
