MongoError: not master at Connection. (/sv_local/npm/node_modules/mongodb/lib/core/connection/pool.js:453:61) at Connection.emit (events.js:189:13) at Connection.EventEmitter.emit (domain.js:459:23) at processMessage (/sv_local/npm/node_modules/mongodb/lib/core/connection/connection.js:456:10) at TLSSocket. (/sv_local/npm/node_modules/mongodb/lib/core/connection/connection.js:625:15) at TLSSocket.emit (events.js:189:13) at TLSSocket.EventEmitter.emit (domain.js:459:23) at addChunk (_stream_readable.js:284:12) at readableAddChunk (_stream_readable.js:265:11) at TLSSocket.Readable.push (_stream_readable.js:220:10) at TLSWrap.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)