Bought composition plugin, upgraded to version that requires payment, entered license key, clicked "enable", see this message:
This add-on couldn't be loaded. It has one or more errors that prevent it from being enabled.
No errors listed, no links to logs, nothing in catalina.out.
Running Confluence 5.6.1.
Found this error after turning on "Diagnostic" log level:
2015-07-30 10:06:50,408 ERROR [http-bio-8090-exec-18653] [atlassian.plugin.manager.DefaultPluginManager] enableConfiguredPluginModule There was an error loading the descriptor 'deck' of plugin 'net.customware.confluence.plugin.composition'. Disabling.
-- url: /rest/plugins/1.0/net.customware.confluence.plugin.composition-key | userName: cwalquist | referer: https://wiki.drwholdings.com/plugins/servlet/upm
java.lang.UnsupportedClassVersionError: net/customware/confluence/plugin/composition/macro/DeckMacro : Unsupported major.minor version 51.0
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