发生了系统错误。 org.apache.velocity.exception.MethodInvocationException: Invocation of method 'processColumn' in class com.liferay.portlet.layoutconfiguration.util.velocity.TemplateProcessor threw exception org.apache.jasper.JasperException: java.lang.NullPointerException @ com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil[3,28]