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java.lang.NullPointerException: 	at ru.runa.wf.web.action.VariableDownloaderAction.execute(VariableDownloaderAction.java:48)	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)	at ru.runa.common.web.UTF8RequestProcessor.process(UTF8RequestProcessor.java:41)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)