Error installing logstash plugin


I have installed logstash 5.5.1 using .tar.

The problem is only installing plug-ins.

I'm geting this error:

/logstash-5.5.1> ./bin/logstash-plugin install file:///tmp/
Installing file: /tmp/
ERROR: An error occured when installing the: file:///tmp/, to have more information about the error add a DEBUG=1 before running the command., message: Could not find gem 'logstash-core (>= 0) java' in source at ./logstash-core.
Source does not contain any versions of 'logstash-core (>= 0) java'

I have tried a lot of steps, but didn't find anything that worked.

Where does come from?

From bin/logstash-plugin prepare-offline-pack logstash-input-tcp

I have tried using other plug-ins as jdbc and snmptrap

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