monstache: server selection error: server selection timeout

$ monstache:

ERROR 2019/11/15 03:35:16 Unable to connect to MongoDB using URL mongodb://localhost:27017: server selection error: server selection timeout
current topology: Type: ReplicaSetNoPrimary
Servers:
Addr: <hostname>:27017, Type: Unknown, State: Connected, Average RTT: 0, Last error: connection(<hostname>:27017[-360]) connection is closed
Addr: <hostname>:27018, Type: Unknown, State: Connected, Average RTT: 0, Last error: connection(<hostname>:27018[-361]) connection is closed
Addr: <hostname>:27019, Type: Unknown, State: Connected, Average RTT: 0, Last error: connection(<hostname>:27019[-362]) connection is closed

rs.status():

{
	"set" : "rs0",
	"date" : ISODate("2019-11-15T11:34:24.146Z"),
	"myState" : 1,
	"term" : NumberLong(6),
	"syncingTo" : "",
	"syncSourceHost" : "",
	"syncSourceId" : -1,
	"heartbeatIntervalMillis" : NumberLong(2000),
	"majorityVoteCount" : 2,
	"writeMajorityCount" : 2,
	"optimes" : {
		"lastCommittedOpTime" : {
			"ts" : Timestamp(1573817656, 1),
			"t" : NumberLong(6)
		},
		"lastCommittedWallTime" : ISODate("2019-11-15T11:34:16.581Z"),
		"readConcernMajorityOpTime" : {
			"ts" : Timestamp(1573817656, 1),
			"t" : NumberLong(6)
		},
		"readConcernMajorityWallTime" : ISODate("2019-11-15T11:34:16.581Z"),
		"appliedOpTime" : {
			"ts" : Timestamp(1573817656, 1),
			"t" : NumberLong(6)
		},
		"durableOpTime" : {
			"ts" : Timestamp(1573817656, 1),
			"t" : NumberLong(6)
		},
		"lastAppliedWallTime" : ISODate("2019-11-15T11:34:16.581Z"),
		"lastDurableWallTime" : ISODate("2019-11-15T11:34:16.581Z")
	},
	"lastStableRecoveryTimestamp" : Timestamp(1573817636, 1),
	"lastStableCheckpointTimestamp" : Timestamp(1573817636, 1),
	"electionCandidateMetrics" : {
		"lastElectionReason" : "priorityTakeover",
		"lastElectionDate" : ISODate("2019-11-15T11:33:36.195Z"),
		"termAtElection" : NumberLong(6),
		"lastCommittedOpTimeAtElection" : {
			"ts" : Timestamp(1573817606, 1),
			"t" : NumberLong(5)
		},
		"lastSeenOpTimeAtElection" : {
			"ts" : Timestamp(1573817606, 1),
			"t" : NumberLong(5)
		},
		"numVotesNeeded" : 2,
		"priorityAtElection" : 1,
		"electionTimeoutMillis" : NumberLong(10000),
		"priorPrimaryMemberId" : 2,
		"numCatchUpOps" : NumberLong(1375993858),
		"newTermStartDate" : ISODate("2019-11-15T11:33:36.575Z"),
		"wMajorityWriteAvailabilityDate" : ISODate("2019-11-15T11:33:37.722Z")
	},
	"members" : [
		{
			"_id" : 0,
			"name" : "<hostname>:27017",
			"ip" : "127.0.0.1",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 79,
			"optime" : {
				"ts" : Timestamp(1573817656, 1),
				"t" : NumberLong(6)
			},
			"optimeDate" : ISODate("2019-11-15T11:34:16Z"),
			"syncingTo" : "",
			"syncSourceHost" : "",
			"syncSourceId" : -1,
			"infoMessage" : "",
			"electionTime" : Timestamp(1573817616, 1),
			"electionDate" : ISODate("2019-11-15T11:33:36Z"),
			"configVersion" : 2,
			"self" : true,
			"lastHeartbeatMessage" : ""
		},
		{
			"_id" : 1,
			"name" : "<hostname>:27018",
			"ip" : "127.0.0.1",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 62,
			"optime" : {
				"ts" : Timestamp(1573817656, 1),
				"t" : NumberLong(6)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1573817656, 1),
				"t" : NumberLong(6)
			},
			"optimeDate" : ISODate("2019-11-15T11:34:16Z"),
			"optimeDurableDate" : ISODate("2019-11-15T11:34:16Z"),
			"lastHeartbeat" : ISODate("2019-11-15T11:34:22.253Z"),
			"lastHeartbeatRecv" : ISODate("2019-11-15T11:34:23.758Z"),
			"pingMs" : NumberLong(0),
			"lastHeartbeatMessage" : "",
			"syncingTo" : "<hostname>:27017",
			"syncSourceHost" : "<hostname>:27017",
			"syncSourceId" : 0,
			"infoMessage" : "",
			"configVersion" : 2
		},
		{
			"_id" : 2,
			"name" : "<hostname>:27019",
			"ip" : "127.0.0.1",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 68,
			"optime" : {
				"ts" : Timestamp(1573817656, 1),
				"t" : NumberLong(6)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1573817656, 1),
				"t" : NumberLong(6)
			},
			"optimeDate" : ISODate("2019-11-15T11:34:16Z"),
			"optimeDurableDate" : ISODate("2019-11-15T11:34:16Z"),
			"lastHeartbeat" : ISODate("2019-11-15T11:34:22.253Z"),
			"lastHeartbeatRecv" : ISODate("2019-11-15T11:34:22.392Z"),
			"pingMs" : NumberLong(0),
			"lastHeartbeatMessage" : "",
			"syncingTo" : "<hostname>:27018",
			"syncSourceHost" : "<hostname>:27018",
			"syncSourceId" : 1,
			"infoMessage" : "",
			"configVersion" : 2
		}
	],
	"ok" : 1,
	"$clusterTime" : {
		"clusterTime" : Timestamp(1573817656, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	},
	"operationTime" : Timestamp(1573817656, 1)
}