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

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This exception has no message.
java.lang.NullPointerException: 	at com.activiti.advance.annotationBasedMappedStatements.CustomMybatisMapperTest.testSelectOneTask(CustomMybatisMapperTest.java:37)	at com.activiti.advance.annotationBasedMappedStatements.CustomMybatisMapperTest.main(CustomMybatisMapperTest.java:55)