The issue asks for help setting up a private network and syncing blocks, but it's vague. The repository is deprecated (description states 'DEPRECATED!'). For guidance, refer to the EthereumJ wiki or archived documentation, but note that the project is no longer maintained. Consider looking at modern Ethereum clients like Geth or Besu for private network setup.
Private net and sync Blocks · ethereum/ethereumj#1048 | Good First Issue