=== UnHandledPromiseRejection ===
Error [ERR_HTTP_HEADERS_SENT] [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at ServerResponse.setHeader (_http_outgoing.js:530:11)
    at ServerResponse.res.setHeader (/app/bundle/programs/server/npm/node_modules/meteor/simple_json-routes/node_modules/connect/lib/patch.js:134:22)
    at app/user-data-download/server/exportDownload.js:14:7
    at /app/bundle/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/fiber_pool.js:43:40 {
  code: 'ERR_HTTP_HEADERS_SENT'
}
---------------------------------
Errors like this can cause oplog processing errors.
Setting EXIT_UNHANDLEDPROMISEREJECTION will cause the process to exit allowing your service to automatically restart the process
Future node.js versions will automatically exit the process
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