old_contents: """Infobip transport."""
  
  from vumi.transports.infobip.infobip import InfobipTransport
  
  __all__ = ['InfobipTransport']
  
new_contents: """Infobip transport."""
  
  from vumi.transports.infobip.infobip import InfobipTransport, InfobipError
  
  __all__ = ['InfobipTransport', 'InfobipError']
  
subject: Add InfobipError to things exported by Infobip package.