As can be seen in the Atlassian Connector Plugin for Eclipse page, currently it can only be integrated with JIRA and Bamboo.
In that plugin's version history you can see that it was possible to integrate with Crucible in the past, but this was discontinued. It's not possible to integrate that plugin with Crucible since the plugin version 3.0.
If you really want to use this plugin in Crucible, you would need to use the plugin version 2.3.0, and the Crucible version should be between 2.0.0 and 2.3.7, which are no longer supported by Atlassian because they have reached the Atlassian Support End of Life Policy.
If this answer was helpful, please allow me to ask you to mark my answer as accepted in order to have it in the top of the thread, also helping other customers.
Thanks in advance!
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