com.atlassian.upm.license.internal.impl.PluginLicenseManagerImpl cannot be cast to com.atlassian.upm.api.license.PluginLicenseManager
Right, but what are you doing to provoke that error?
Check you're using the right version of the plugin for your version of Jira first, then I'd have a quick look at the logs, and then think about getting in touch with Go2group, report a bug with them?
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