Thanks for your reply, but what do you mean with "seed"?
Did you try importing your seed into electrum? I think multibit and electrum use the same type of seed. Good thing you stored the seed safely, do not panic your coins are not lost. Do not share the seed with anyone. Download electrum and try importing your seed in there.
Jacob
He means the the wallet words you used when you created your multibit HD wallet. The wallet words are the seed.
I tried importing my multibit HD seed into electrum, but it wouldn't let me import them until I clicked the options button, then checked "BIP39 seed". Although electrum create a wallet using my multibit HD words it didn't show the same addresses as in my multibit HD wallet. Either I did something wrong, or that technique doesn't work.
This might be why the technique didn't work
http://bitcoin.stackexchange.com/questions/20174/export-wallet-from-multibit-to-electrumMultibit creates addresses using compressed private key, while Electrum uses uncompressed private keys. You can't decompress key - it will change public address, not allowing you to use your coins.