FILE_FORMAT_ERROR using BatchJobService.

[lzhuo]

I use BatchJobHelper to upload operations to AdWords, but there are a lot 
of FILE_FORMAT errors. Why does this happen even the request was handled by 
the client library? By the way, I upload the operations in an incremental 
way. like 
this: jobHelper.uploadIncrementalBatchJobOperations(currentOperations, 
lastUpload, lastUploadStatus).

<soap:Body>
        <getResponse 
xmlns="https://adwords.google.com/api/adwords/cm/v201509";>
            <rval>
                <totalNumEntries>1</totalNumEntries>
                <Page.Type>BatchJobPage</Page.Type>
                <entries>
                    <id>1128059</id>
                    <status>CANCELED</status>
                    <progressStats>
                        <numOperationsExecuted>0</numOperationsExecuted>
                        <numOperationsSucceeded>0</numOperationsSucceeded>
                        
<estimatedPercentExecuted>0</estimatedPercentExecuted>
                    </progressStats>
                    <downloadUrl>
                        
<url>https://batch-job-download-prod-ebe9b43.storage.googleapis.com/79037285
/1128059.results.xml?GoogleAccessId=926043054183-rbu1gkdushnqrfcf47gser4u8qse2ig4@developer.gservice
account.com&amp;Expires=1454745731&amp;Signature=J%2BHIGRT%2BCKhh5iUT40twZZwXexzeYJD%2FPwHXidZe170j7
BRROK75IJAW8p8%2FEQfSaSIRo7E4GOLvqthSqmuIw6aCL%2B3MZmGTu85WcOb6pG1qtJTO34maFf%2FVZ3ZEGjvqxhE0%2BrQ1%
2B0%2FkdWjA9K9EDi%2FT1Uf5827Q3I4SWYLs1zwRnRlgmaqc%2FoqXpA%2FAB6lFdfh9r7uCUw9fwIQDBuIeWmtnhG%2BxytQyZ
k%2FpMbcbkXdoFHQvJCAmqvWWxiT%2Fw%2BcSpd0BnWR5%2FKTTX755ozneOjKqN7xcS7REd4h7maefSRWLAOJIctEaENfN2bGwj
YyTidutingG5J6uV44xioJ4sw%3D%3D</url>
                        <expiration>20160206 000211 
America/Los_Angeles</expiration>
                    </downloadUrl>
                    <processingErrors>
                        <fieldPath/>
                        <trigger/>
                        
<errorString>BatchJobProcessingError.FILE_FORMAT_ERROR</errorString>
                        
<ApiError.Type>BatchJobProcessingError</ApiError.Type>
                        <reason>FILE_FORMAT_ERROR</reason>
                    </processingErrors>
                </entries>
            </rval>
        </getResponse>
    </soap:Body>
</soap:Envelope>

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