PersistenceBrokerException: Error reading class

org.apache.ojb.broker.PersistenceBrokerException: Error reading class 'org.kuali.kfs.vnd.businessobject.ContactType' from result set, current read field was 'versionNumber'
    at oracle.jdbc.driver.CharCommonAccessor.getLong(CharCommonAccessor.java:297)
    at oracle.jdbc.driver.T4CVarcharAccessor.getLong(T4CVarcharAccessor.java:862)
    at oracle.jdbc.driver.OracleResultSetImpl.getLong(OracleResultSetImpl.java:985)
    at org.apache.ojb.broker.metadata.JdbcTypesHelper$T_BigInt.readValueFromResultSet(Unknown Source)
    at org.apache.ojb.broker.metadata.JdbcTypesHelper$BaseType.getObjectFromColumn(Unknown Source)
    at org.apache.ojb.broker.accesslayer.RowReaderDefaultImpl.readValuesFrom(Unknown Source)
    at org.apache.ojb.broker.accesslayer.RowReaderDefaultImpl.readObjectArrayFrom(Unknown Source)
    at org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResultSet(Unknown Source)
    at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source)
    at za.org.kuali.rice.krad.dao.impl.PagedCollection$PagedCollectionIterator.next(PagedCollection.java:108)
    at za.org.kuali.rice.krad.dao.impl.PagedCollectionTest.testIterator(PagedCollectionTest.java:80)