I assume you are running JIRA version 5.2.x? In that case, please download my pre-v2.2 from my server at http://www.polscheit.de/plugins/jira/gantt-chart/gantt-2.2-JIRA5.2-UPM2.8.1.jar and install it via "upload" link on the tab "manage addons".
In some cases, prior versions conflict with some other plugins having the same "admin"-action. Generally, JIRA should treat plugins separately within a kind of sandboxe per plugin, but this seems to be a bug in JIRA. The workaround was just to rename the action to become unique.
Does this work for you? Otherwise, please provide me with additional information about your envrionment (jira version, Gantt-Chart version, log file and screenshots) via email at email@example.com due to privacy and security (such infos should not be pubished to everybody I assume).
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