Oracle Message NCR-03025 - NCRO: Failed to make LIST connection(s)

ERRORNCRO: Failed to make LIST connection(s)
CAUSEFailure to make LIST connection(s) usually means one of two things: (1) Address list syntax error, (2) Could not connect with supplied addresses
ACTIONCheck address list syntax and make sure that there is a listener process for each (or some) of the supplied addresses.