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java.lang.NullPointerException: 	at com.atlassian.plugin.loaders.SinglePluginLoader.loadPlugins(SinglePluginLoader.java:52)	at com.atlassian.plugin.loaders.SinglePluginLoader.getPlugins(SinglePluginLoader.java:133)	at com.atlassian.plugin.DefaultPluginManager.init(DefaultPluginManager.java:31)	at com.atlassian.jira.plugin.JiraPluginManager.start(JiraPluginManager.java:35)	at com.atlassian.jira.ComponentManager.quickStart(ComponentManager.java:213)	at com.atlassian.jira.ComponentManager.start(ComponentManager.java:194)	at com.atlassian.jira.upgrade.ConsistencyLauncher.contextInitialized(ConsistencyLauncher.java:25)	at com.caucho.server.http.Application.init(Application.java:1843)	at com.caucho.server.http.VirtualHost.init(VirtualHost.java:728)	at com.caucho.server.http.ServletServer.initHosts(ServletServer.java:874)	at com.caucho.server.http.ServletServer.initInternal(ServletServer.java:719)	at com.caucho.server.http.ServletServer.init(ServletServer.java:530)	at com.caucho.server.http.ResinServer.init(ResinServer.java:393)	at com.caucho.server.http.ResinServer.main(ResinServer.java:1154)	at com.caucho.server.http.HttpServer.main(HttpServer.java:103)