java.lang.NullPointerException: This exception has no message.

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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 ru.runa.common.web.UTF8RequestProcessor.process(UTF8RequestProcessor.java:41)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)

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