配置NWDI时报异常

根据下面这个链接

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/7014086d-3fd9-2910-80bd-be3417810c6f?QuickLink=index&overridelayout=true

当我配置NWDI时在configuration wizard下选择Change Management Service (CMS): Create an Application Skeleton点击start后在浏览器中报以下异常：

java.lang.NullPointerException: while trying to invoke the method java.util.Collection.iterator() of an object loaded from local variable 'col'

    at com.sap.tc.lm.ctc.ccl.wd.DataEditingViewController.showViolatedConstrains(DataEditingViewController.java:280)

    at com.sap.tc.lm.ctc.ccl.wd.DataEditingViewController.modifyView(DataEditingViewController.java:266)

    at com.sap.tc.lm.ctc.ccl.templateinstaller.DataEditingView.wdDoModifyView(DataEditingView.java:152)

    at com.sap.tc.lm.ctc.ccl.templateinstaller.wdp.InternalDataEditingView.wdDoModifyView(InternalDataEditingView.java:462)

    at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doModifyView(DelegatingView.java:94)

    ... 58 more

这是什么原因啊