flex.messaging.MessageException: Unable to create a new instance of type 'sample.crm.domain.customer.CommercialEstablishment'. Abstract types cannot be instantiated.

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flex.messaging.MessageException: Unable to create a new instance of type 'sample.crm.domain.customer.CommercialEstablishment'. Abstract types cannot be instantiated.
at flex.messaging.util.ClassUtil.createDefaultInstance(ClassUtil.java:161)
at flex.messaging.io.AbstractProxy.createInstanceFromClassName(AbstractProxy.java:102)
at org.springframework.flex.core.io.SpringPropertyProxy.proxyFor(SpringPropertyProxy.java:78)
at org.springframework.flex.core.io.AbstractAmfConversionServiceConfigProcessor.registerAmfProxies(AbstractAmfConversionServiceConfigProcessor.java:107)
at org.springframework.flex.core.io.AbstractAmfConversionServiceConfigProcessor.processAfterStartup(AbstractAmfConversionServiceConfigProcessor.java:68)
at org.springframework.flex.core.MessageBrokerFactoryBean.processAfterStart(MessageBrokerFactoryBean.java:315)
at org.springframework.flex.core.MessageBrokerFactoryBean.afterPropertiesSet(MessageBrokerFactoryBean.java:177)

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