Error Missing Parameter with function DownloadClientReport (v201209)

[Reinhold Maurus]

I have converted a Keyword Performance Program in MS VS 2008 c# to API 
v201209 and have an error when downloading a report. Error Code: 

<?xml version="1.0" encoding="UTF-8" 
standalone="yes"?><reportDownloadError><ApiError><type>ReportDownloadError.MISSING_PARAMETER</type><trigger>Missing
 
client 
information</trigger><fieldPath></fieldPath></ApiError></reportDownloadError> 


See attached code snippets. I checked all parameters and they look correct. 
I´m using the Adwords Client lib. v 15.2 for c# and use the MCC 
authentication (AdWordsUser). Does anyone know how to get the parameter 
missing or can anyone help me or knows someone who can debug the error?

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          // Create a custom AdWordsUser.
          AdWordsUser AdUser = new AdWordsUser(headers);


          ReportDefinition definition = new ReportDefinition();
          definition.reportName = "KEYWORDS_PERFORMANCE_REPORT";
          definition.reportType = 
ReportDefinitionReportType.KEYWORDS_PERFORMANCE_REPORT;
          definition.downloadFormat = DownloadFormat.XML;
          definition.dateRangeType = ReportDefinitionDateRangeType.CUSTOM_DATE;

          Selector reportselector = new Selector();
          
          reportselector.fields = new string[] { 
                    "AccountDescriptiveName",    //CustomerName
                    "CampaignName",              //Campaign
                    "AdGroupName",               //AdGroup
                    "KeywordText"                //Keyword
                };
          Predicate predicate = new Predicate();
          predicate.field = "Status";
          predicate.@operator = PredicateOperator.IN;
          predicate.values = new string[] { "ACTIVE", "PAUSED" };
          reportselector.predicates = new Predicate[] { predicate };
          definition.selector = reportselector;
          definition.selector.dateRange = new DateRange();

          string sVMonth, sVDay, sEMonth, sEDay;
          if (dtStartDate.Month < 10) { sVMonth = "0" + 
dtStartDate.Month.ToString(); } else { sVMonth = dtStartDate.Month.ToString(); }
          if (dtStartDate.Day < 10) { sVDay = "0" + dtStartDate.Day.ToString(); 
} else { sVDay = dtStartDate.Day.ToString(); }
          if (dtEndDate.Month < 10) { sEMonth = "0" + 
dtEndDate.Month.ToString(); } else { sEMonth = dtEndDate.Month.ToString(); }
          if (dtEndDate.Day < 10) { sEDay = "0" + dtEndDate.Day.ToString(); } 
else { sEDay = dtEndDate.Day.ToString(); }
          definition.selector.dateRange.min = dtStartDate.Year.ToString() + 
sVMonth + sVDay;
          definition.selector.dateRange.max = dtEndDate.Year.ToString() + 
sEMonth + sEDay;

          definition.includeZeroImpressions = true;

          string date1 = definition.selector.dateRange.min, date2 = 
definition.selector.dateRange.max;

          string von = date1.Substring(0, 4) + "_" + date1.Substring(4, 2) + 
"_" + date1.Substring(6, 2);
          string bis = date2.Substring(0, 4) + "_" + date2.Substring(4, 2) + 
"_" + date2.Substring(6, 2);

          string folder = "etc/reports/xml/" + von + "-" + bis;
          System.IO.Directory.CreateDirectory(folder);
          string filename = tmp[0] + ".xml";
          new ReportUtilities(AdUser).DownloadClientReport(definition, folder + 
"/" + filename);