Error #2048: Security sandbox violation

[leexing]

Error #2048: Security sandbox violation

    SecurityError: Error #2048: Security sandbox violation: http://192.168.0.101/CoalInfoSystem/MainPage.swf cannot load data from http://localhost/arcgis/rest/service...pServer?f=json �??
    at MethodInfo-1575()
    at mx.rpc::Responder/fault()
    at mx.rpc::AsyncToken/http://www.adobe.com/2006/flex/mx/internal::applyFault()
    at mx.rpc.events::FaultEvent/http://www.adobe.com/2006/flex/mx/internal::callTokenResponders()
    at HTTPOperation/http://www.adobe.com/2006/flex/mx/internal::dispatchRpcEvent()
    at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler()
    at mx.rpc::Responder/fault()
    at mx.rpc::AsyncRequest/fault()
    at DirectHTTPMessageResponder/securityErrorHandler()
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at flash.net::URLLoader/redirectEvent()

    I have added the crossdomain.xml to C:\Inetpub\wwwroot, the content is as follows:

    <?xml version="1.0" ?>
    <!DOCTYPE cross-domain-policy (View Source for full doctype...)>
    <cross-domain-policy>
    <site-control permitted-cross-domain-policies="all" />
    <allow-access-from domain="*" secure="true" />
    </cross-domain-policy>

    but it is still return the same error!!

[DasaPaddock]

The DOCTYPE is invalid. Try removing it or using:
<!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd">

Also make sure http://localhost/crossdomain.xml loads fine in Firefox or IE.