java.lang.IllegalArgumentException: object is not an instance of declaring class

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java.lang.IllegalArgumentException: object is not an instance of declaring class
at groovy.lang.MetaBeanProperty.getProperty(MetaBeanProperty.java:62)
at groovy.util.BuilderSupport.invokeMethod(BuilderSupport.java:67)
at mypackage.TestDomainClass._clinit__closure1(TestDomainClass.groovy:7)
at mypackage.TestDomainClass._clinit__closure1(TestDomainClass.groovy)
at groovy.lang.Closure.call(Closure.java:414)
at groovy.lang.Closure.call(Closure.java:408)
at org.grails.validation.DefaultConstraintEvaluator.evaluateConstraintsMap(DefaultConstraintEvaluator.java:239)
at org.grails.validation.DefaultConstraintEvaluator.evaluateConstraints(DefaultConstraintEvaluator.java:132)
at org.grails.validation.DefaultConstraintEvaluator.evaluateConstraints(DefaultConstraintEvaluator.java:119)
at org.grails.validation.DefaultConstraintEvaluator.evaluate(DefaultConstraintEvaluator.java:108)
at org.grails.core.DefaultGrailsDomainClass.initializeConstraints(DefaultGrailsDomainClass.java:755)
at org.grails.core.DefaultGrailsDomainClass.getConstrainedProperties(DefaultGrailsDomainClass.java:746)
at org.grails.validation.GrailsDomainClassValidator.validate(GrailsDomainClassValidator.java:76)
at org.grails.orm.hibernate.AbstractHibernateGormInstanceApi.save(AbstractHibernateGormInstanceApi.groovy:122)
at mypackage.TestDomainClassSpec.$tt__$spock_feature_1_0(TestDomainClassSpec.groovy:15)

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