Gem file Error

We are unable to start logstash due to gemfile error
[ERROR] 2019-09-13 12:52:22.884 [main] Logstash - java.lang.IllegalStateException: Logstash stopped processing because of an error: (GemNotFound) Could not find public_suffix-3.0.3 in any of the sources

How should we resolve this error ? Please tell us the solution as ASAP