InputDataError calling RequestReport

[ryderdale]

I'm getting InputDataError when running GetReport after successfully running RequestReport. Code:
mws.Reports.RequestReport({ ReportType: '_GET_V1_SELLER_PERFORMANCE_REPORT_', MarketplaceIdList: 'ATVPDKIKX0DER', StartDate: '2018-10-01', EndDate: '2018-10-31', }) .then(({ result, metadata }) => { console.log(result, "metadata: ", metadata) console.log("reportID: ",result.ReportRequestInfo.ReportRequestId) mws.Reports.GetReport({ ReportId: result.ReportRequestInfo.ReportRequestId }) .then(({ result, metadata })=> { console.log("result: ",result, "metadata: ", metadata) }) .catch((error)=> { console.log(error) }) }) .catch((error)=> { console.log(error) })