text: class OceanKeeperContractsNotFound(Exception):
      """Raised when is not possible to find the keeper contracts abi."""
  
  
  class OceanDIDNotFound(Exception):
      """Raised when a requested DID or a DID in the chain cannot be found."""
  
  
  class OceanInvalidTransaction(Exception):
      """Raised when an on-chain transaction fail."""
  