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

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java.lang.NullPointerException:
at com.healthmarketscience.sqlbuilder.dbspec.basic.DbForeignKeyConstraint.(DbForeignKeyConstraint.java:42)
at com.healthmarketscience.sqlbuilder.dbspec.basic.DbSpec.createColumnForeignKeyConstraint(DbSpec.java:279)
at com.healthmarketscience.sqlbuilder.dbspec.basic.DbColumn.references(DbColumn.java:239)
at foo.bar.DbTest.(DbTest.java:49)
at foo.bar.DbTest.main(DbTest.java:73)

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