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java.lang.NullPointerException at ru.runa.wf.web.action.VariableDownloaderAction.execute(VariableDownloaderAction.java:48)[classes:] at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)[struts-core-1.3.8.jar:1.3.8] at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)[struts-core-1.3.8.jar:1.3.8] at ru.runa.common.web.UTF8RequestProcessor.process(UTF8RequestProcessor.java:41)[classes:] at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)[struts-core-1.3.8.jar:1.3.8] at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)[struts-core-1.3.8.jar:1.3.8]