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

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java.lang.NullPointerException:
at org.jasig.portal.layout.dlm.remoting.UpdatePreferencesServlet.changeColumns(UpdatePreferencesServlet.java:324)
at org.jasig.portal.layout.dlm.remoting.UpdatePreferencesServlet.doPost(UpdatePreferencesServlet.java:151)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

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