#Add the snippet bellow to the end of the "Register" Method registry.register( "3.9.0", "3.10.0", new com.liferay.dynamic.data.mapping.internal.upgrade.v3_10_0. UpgradeDDMStructure( _jsonDDMFormDeserializer, _ddmFormLayoutDeserializer, _ddmFormLayoutSerializer, _jsonDDMFormSerializer)); #Add the following snippet to the end of the Class @Reference private DDMFormLayoutSerializer _ddmFormLayoutSerializer;