TopologyException on left join - scala

Question

I'm trying to do a simple stream.leftJoin(table) but get the following exception at runtime:
TopologyException: Invalid topology: StateStore null is not added yet
This is what my code roughly looks like, I commented out the implementation details to keep it short:
val streamsConfiguration: Properties = {
val p = new Properties()
// api config
p.put(StreamsConfig.APPLICATION_ID_CONFIG /**/)
p.put(StreamsConfig.CLIENT_ID_CONFIG /**/)
// kafka broker
p.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092")
// local state store
p.put(StreamsConfig.STATE_DIR_CONFIG, "./streams-state")
p.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest")
// serdes
p.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, classOf[StringSerde])
p.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, classOf[StringSerde])
p
}
val builder = new StreamsBuilderS()
val rawInfoTable: KTableS[String, String] = builder.table("station_info")
val infoTable: KTableS[String, StationInfo] = rawInfoTable.mapValues{jsonString =>
/** */
}.filter(/** */)
.mapValues((/** */)
val rawStatusStream: KStreamS[String, String] = builder.stream("station_status")
val statusStream: KStreamS[String, StationStatus] = rawStatusStream.flatMapValues{jsonString =>
/** */
}
val outputStream: KStreamS[String, String] = statusStream
.leftJoin(infoTable, calculateStats)
.filter((_, availability) => {
/** */
})
.map((stationId: String, availability) => {
/** */
})
outputStream.to("low_availability")
val streams = new KafkaStreams(builder.build(), streamsConfiguration)
streams.cleanUp()
streams.start()
I even tried to manually add a StateStore via:
val store = Stores.inMemoryKeyValueStore("my-store")
val storeBuilder = Stores.keyValueStoreBuilder(store, new StringSerde(), new StringSerde())
val builder = new StreamsBuilderS()
builder.addStateStore(storeBuilder)
But it doesn't seem to change anything. I'm using the kafka streams wrapper from lightbend: "com.lightbend" %% "kafka-streams-scala" % "0.2.1"
All the examples I checked don't seem to care about adding a state store, so I'm somewhat confused. Can somebody point me in the right direction? Does this have to do something the STATE_DIR_CONFIG? Or with the Kafka cluster I'm running locally?