Error Returned from Bulk Operation

<xml version="1.0" encoding="UTF-8" standalone="yes">
<QCRestException>
    <Id>qccore.bulk-operation-failed</Id>
    <Title>bulk failed. see exception properties.</Title>
    <ExceptionProperties>
        <ExceptionProperty name="qccore.bulk-operation-failed">
            <value>
                <BulkOperationFailed>
                    <BulkEntry Successful="true"  EntityId="1"  EntityType="defect">
                        <Entity Type="defect">
                            <Fields>
                                ...
                             </Fields>
                         </Entity>
                     </BulkEntry>
                         <BulkEntry Successful="false" EntityId="2"  EntityType="defect">
                         <Id>qccore.required-field-missing</Id>
                         <Title>missing required field.</Title>
                         <StackTrace>
                             ...
                         </StackTrace>
                     </BulkEntry>
                     <BulkEntry  Successful="false"  EntityId="3" EntityType="defect">
                         <Id>qccore.operation-forbidden</Id>
                         <Title>user has no permission to update this entity</Title>
                         <StackTrace>
                             ...
                         </StackTrace>
                     </BulkEntry>
                 </BulkOperationFailed>
             </value>
         </ExceptionProperty>
     </ExceptionProperties>
</QCRestException>