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java.lang.NullPointerException: 	at com.atlassian.confluence.plugin.feedburner.PopularItemsFeedAction.execute(PopularItemsFeedAction.java:33)	at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)	at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)