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

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This exception has no message.
java.lang.NullPointerException:
at com.commercehub.common.jdo.PersistentObject.jdoPostLoad(PersistentObject.java:29)
at com.solarmetric.kodo.runtime.StateManagerImpl.checkDefaultFetchGroup(StateManagerImpl.java:663)
at com.solarmetric.kodo.runtime.StateManagerImpl.makeDirty(StateManagerImpl.java:611)
at com.solarmetric.kodo.runtime.StateManagerImpl.setObjectField(StateManagerImpl.java:825)
at com.solarmetric.kodo.runtime.StateManagerImpl.setStringField(StateManagerImpl.java:844)
at com.commercehub.common.jdo.PersistentObject.jdoSetcom_commercehub_common_jdo_PersistentObject_aString(PersistentObject.java)
at com.commercehub.common.jdo.PersistentObject.main(PersistentObject.java:64)

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