flex.messaging.MessageException: Cannot create class of type 'mx.collections.Arr ayCollection'. Type 'mx.collections.ArrayCollection' not found.

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flex.messaging.MessageException: Cannot create class of type 'mx.collections.Arr ayCollection'. Type 'mx.collections.ArrayCollection' not found.
at flex.messaging.util.ClassUtil.createClass(ClassUtil.java:70)
at flex.messaging.io.AbstractProxy.getClassFromClassName(AbstractProxy.java:87)
at flex.messaging.io.amf.AbstractAmfInput.createObjectInstance(AbstractAmfInput.java:160)
at flex.messaging.io.amf.Amf3Input.readScriptObject(Amf3Input.java:409)
at flex.messaging.io.amf.Amf3Input.readObjectValue(Amf3Input.java:152)
at flex.messaging.io.amf.Amf3Input.readObject(Amf3Input.java:130)
at flex.messaging.io.amf.Amf3Input.readScriptObject(Amf3Input.java:437)
at flex.messaging.io.amf.Amf3Input.readObjectValue(Amf3Input.java:152)
at flex.messaging.io.amf.Amf3Input.readObject(Amf3Input.java:130)
at flex.messaging.io.amf.Amf3Input.readArray(Amf3Input.java:358)
at flex.messaging.io.amf.Amf3Input.readObjectValue(Amf3Input.java:156)
at flex.messaging.io.amf.Amf3Input.readObject(Amf3Input.java:130)
at flex.messaging.io.amf.Amf3Input.readScriptObject(Amf3Input.java:437)
at flex.messaging.io.amf.Amf3Input.readObjectValue(Amf3Input.java:152)
at flex.messaging.io.amf.Amf3Input.readObject(Amf3Input.java:130)
at flex.messaging.io.amf.Amf0Input.readObjectValue(Amf0Input.java:123)
at flex.messaging.io.amf.Amf0Input.readArrayValue(Amf0Input.java:359)
at flex.messaging.io.amf.Amf0Input.readObjectValue(Amf0Input.java:127)
at flex.messaging.io.amf.Amf0Input.readObject(Amf0Input.java:94)
at flex.messaging.io.amf.AmfMessageDeserializer.readObject(AmfMessageDeserializer.java:227)
at flex.messaging.io.amf.AmfMessageDeserializer.readBody(AmfMessageDeserializer.java:206)
at flex.messaging.io.amf.AmfMessageDeserializer.readMessage(AmfMessageDeserializer.java:126)
at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:145)
at flex.messaging.endpoints.BaseHTTPEndpoint.service(BaseHTTPEndpoint.java:291)
at org.springframework.flex.servlet.MessageBrokerHandlerAdapter.handle(MessageBrokerHandlerAdapter.java:109)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:284)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:322)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)

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