same error (((what to do? developers
read post above
try this one solution from telegram
[telegram] Hey, everyone!
For all who had a problem with not syncing GUI wallet (Swing wallet) there is a solution:
1). download a blockchain bootstrap from:
https://s3-us-west-1.amazonaws.com/cryptochainer/blockchains/BitcoinZ_blockchain.zip2) delete all
excluding wallet.dat (!) in ../AppData/Roaming/BitcoinZ
3) extract downloaded zip file into BitcoinZ directory
4) start bitcoinz-wallet.exe (1.0.1.2) or bitcoinz-wallet.bat (1.0.1.4)
5) enjoy!