Trying to use bar codes

I often get refusal when trying to add to my catalogue using bar code reader.
Below is typical "log" given for this "inability". What is wrong? Some of this material has only been in catalogue for few months and is up there in Amazon's site.Don't they like Orange?
Connecting to ecs.amazonaws.co.uk
>| GET /onca/xml?AWSAccessKeyId=0KVBS3ZNNEXJ2JXM9C02&AssociateT ag=orangesuitemu-20&IdType=UPC&ItemId=5099945776724&Operation=ItemL ookup&ResponseGroup=ItemAttributes%2CTracks%2CImag es%2CEditorialReview&SearchIndex=Classical&Service =AWSECommerceService&Timestamp=2013-04-09T15%3A51%3A21Z&Version=2011-08-01&Signature=/g39WRIbmi8bPlOFYxRFd1w0XXOR1mZMI7PeZDzXLlQ%3D HTTP/1.1
>| User-Agent: OrangeCD 6.5
>| Host: ecs.amazonaws.co.uk
>| Connection: Keep-Alive
>|
<| HTTP/1.1 200 OK
<| Date: Tue, 09 Apr 2013 15:50:10 GMT
<| Server: Server
<| Content-Type: text/xml;charset=UTF-8
<| Vary: Accept-Encoding,User-Agent
<| nnCoection: close
<| Transfer-Encoding: chunked
<|
<| <?xml version="1.0" ?><ItemLookupResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2011-08-01"><OperationRequest><HTTPHeaders><Header Name="UserAgent" Value="OrangeCD 6.5"></Header></HTTPHeaders><RequestId>b323c9b7-2578-4a19-baa6-0de0fd83904d</RequestId><Arguments><Argument Name="Service" Value="AWSECommerceService"></Argument><Argument Name="Timestamp" Value="2013-04-09T15:51:21Z"></Argument><Argument Name="Operation" Value="ItemLookup"></Argument><Argument Name="AssociateTag" Value="orangesuitemu-20"></Argument><Argument Name="Version" Value="2011-08-01"></Argument><Argument Name="SearchIndex" Value="Classical"></Argument><Argument Name="Signature" Value="/g39WRIbmi8bPlOFYxRFd1w0XXOR1mZMI7PeZDzXLlQ="></Argument><Argument Name="ItemId" Value="5099945776724"></Argument><Argument Name="IdType" Value="UPC"></Argument><Argument Name="AWSAccessKeyId" Value="0KVBS3ZNNEXJ2JXM9C02"></Argument><Argument Name="ResponseGroup" Value="ItemAttributes,Tracks,Images,EditorialRevie w"></Argument></Arguments><RequestProcessingTime>0.018169000000000 0</RequestProcessingTime></OperationRequest><Items><Request><IsValid>True</IsValid><ItemLookupRequest><IdType>UPC</IdType><ItemId>5099945776724</ItemId><ResponseGroup>ItemAttributes</ResponseGroup><ResponseGroup>Tracks</ResponseGroup><ResponseGroup>Images</ResponseGroup><ResponseGroup>EditorialReview</ResponseGroup><SearchIndex>Classical</SearchIndex><VariationPage>All</VariationPage></ItemLookupRequest><Errors><Error><Code>AWS.Invalid ParameterValue</Code><Message>5099945776724 is not a valid value for ItemId. Please change this value and retry your request.</Message></Error></Errors></Request></Items></ItemLookupResponse>