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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:592)	at oracle.apps.fnd.framework.webui.OAPageContextImpl.putSessionValue(OAPageContextImpl.java:1433)	at indus.oracle.apps.ak.attach.webui.IndusAkAttachUpload2COXX.processRequest(IndusAkAttachUpload2COXX.java:18)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:596)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:251)	at oracle.apps.fnd.framework.webui.beans.layout.OAHeaderBean.processRequest(OAHeaderBean.java:391)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:964)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:931)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:655)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:251)	at oracle.apps.fnd.framework.webui.beans.layout.OAStackLayoutBean.processRequest(OAStackLayoutBean.java:350)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:964)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:931)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:655)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:251)	at oracle.apps.fnd.framework.webui.beans.layout.OAHeaderBean.processRequest(OAHeaderBean.java:391)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:964)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:931)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:655)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:251)	at oracle.apps.fnd.framework.webui.beans.layout.OAStackLayoutBean.processRequest(OAStackLayoutBean.java:350)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:964)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:931)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:655)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:251)	at oracle.apps.fnd.framework.webui.OAPageLayoutHelper.processRequest(OAPageLayoutHelper.java:1166)	at oracle.apps.fnd.framework.webui.beans.layout.OAPageLayoutBean.processRequest(OAPageLayoutBean.java:1569)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:964)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:931)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:655)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:251)	at oracle.apps.fnd.framework.webui.beans.form.OAFormBean.processRequest(OAFormBean.java:385)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:964)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequestChildren(OAWebBeanHelper.java:931)	at oracle.apps.fnd.framework.webui.OAWebBeanHelper.processRequest(OAWebBeanHelper.java:655)	at oracle.apps.fnd.framework.webui.OAWebBeanContainerHelper.processRequest(OAWebBeanContainerHelper.java:251)	at oracle.apps.fnd.framework.webui.beans.OABodyBean.processRequest(OABodyBean.java:353)	at oracle.apps.fnd.framework.webui.OAPageBean.processRequest(OAPageBean.java:2496)	at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1892)	at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:536)	at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:424)