flex 异常处理

(mx.messaging.messages::ErrorMessage)#0
? body = (null)
? clientId = "FABE7FB0-830A-6390-6E73-B0C259D1891F"
? correlationId = "BA05D912-C85F-AF0D-EE81-7DAB9C468A4C"
? destination = "healthMonitorService"
? extendedData = (null)
? faultCode = "Server.ResourceUnavailable"
? faultDetail = "The expected argument types are (com.ctvit.gather.entity.MaterialDto) but the supplied types were (flex.messaging.io.amf.ASObject) and converted to (null)."
? faultString = "Cannot invoke method 'getMaterialList'."
? headers = (Object)#1
? messageId = "FABEADEC-7309-FF0B-9CC6-EBA6172F9BB1"
? rootCause = (mx.messaging.messages::ErrorMessage)#2
? ? body = (null)
? ? clientId = (null)
? ? correlationId = (null)
? ? destination = (null)
? ? extendedData = (null)
? ? faultCode = "Client.Message.Deserialize.InvalidType"
? ? faultDetail = (null)
? ? faultString = "Cannot convert type flex.messaging.io.amf.ASObject with remote type specified as 'null' to an instance of class com.ctvit.gather.entity.MaterialDto"
? ? headers = (Object)#3
? ? messageId = "FABEADEC-731D-AD75-C334-A3F0AF8F15E2"
? ? rootCause = (null)
? ? timestamp = 1410857207587
? ? timeToLive = 0
? timestamp = 1410857207587

? timeToLive = 0

场景描述： 其中一个flex项目module ?嵌入到另一个flex项目中?而且单独用该模块在本地测试怎么都没问题

这个错误初看是类型不匹配，可是我另一个方法调用参数类型什么都是一样的，怎么就无法转换呢？

经过百度