Unfortunately, that error is fairly "terminal"... once you get it, there really is no recovery except for trying to export your wallet keys and importing them into another wallet like Electrum. From my investigations, the version of BitcoinJ that MultiBit Classic and MultiBitHD are using is unable to handle some of the data included in new transactions. There are a number of examples of this error in the MultiBit subforum:
https://bitcointalk.org/index.php?board=99.0If you have a .key file backup or a .wallet file, you might be able to use my Python scripts to recover the keys:
https://github.com/HardCorePawn/multibit_recovery/Let me know if you need any help.