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

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This exception has no message.
java.lang.NullPointerException:
at kodo.jdbc.meta.MetaDataMappingFactory.addExtensions(MetaDataMappingFactory.java:253)
at kodo.jdbc.meta.MetaDataMappingFactory.addMappingExtensions(MetaDataMappingFactory.java:219)
at kodo.jdbc.meta.MetaDataMappingFactory.storeMappings(MetaDataMappingFactory.java:162)
at kodo.jdbc.meta.MappingTool.record(MappingTool.java:481)
at kodo.jdbc.meta.MappingTool.run(MappingTool.java:912)
at kodo.jdbc.ant.MappingToolTask.executeOn(MappingToolTask.java:175)
at com.solarmetric.ant.TaskBase.execute(TaskBase.java:105)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:193)
at org.apache.tools.ant.Task.perform(Task.java:341)
at org.apache.tools.ant.Target.execute(Target.java:309)
at org.apache.tools.ant.Target.performTasks(Target.java:336)
at org.apache.tools.ant.Project.executeTarget(Project.java:1339)
at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:397)
at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:143)
at org.apache.tools.ant.Task.perform(Task.java:341)
at org.apache.tools.ant.Target.execute(Target.java:309)
at org.apache.tools.ant.Target.performTasks(Target.java:336)
at org.apache.tools.ant.Project.executeTarget(Project.java:1339)
at org.apache.tools.ant.Project.executeTargets(Project.java:1255)
at org.apache.tools.ant.Main.runBuild(Main.java:609)
at org.apache.tools.ant.Main.start(Main.java:196)

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