WARN - Running Spark Locally with Docker - Initial job has not accepted any resources - apache-spark

Question

I launched Spark master and worker in my laptop using Docker bridge network spark
docker network create spark
I put the following command
docker run -ti -p 8080:8080 -p 7077:7077 -p 4040:4040 -e SPARK_NO_DAEMONIZE=true --network=spark --name spark-master apache/spark:v3.3.0 /opt/spark/sbin/start-master.sh
docker run -ti -p 8080:8080 -p 7077:7077 -p 4040:4040 -e SPARK_NO_DAEMONIZE=true --network=spark --name spark-master apache/spark:v3.3.0 /opt/spark/sbin/start-worker.sh spark://<master>:7077
Once they both start, I try and launch the following application code from my IDE (written in Kotlin, but doesn't matter if it's also in Java)
var sparkSession = SparkSession.builder()
.appName("mapreduce")
.master("spark://localhost:7077")
.config("spark.dynamicAllocation.enabled", "false")
.orCreate
var dataset: Dataset<String> = sparkSession.createDataset(listOf("Banana", "Car", "Glass", "Banana", "Computer", "Car"),
Encoders.STRING())
dataset = dataset.map(MapFunction{c: String->"word: "+c} , Encoders.STRING())
dataset.show()
The code works if master is local. I opened localhost:8080 and localhost:8081 and I can see the job getting registered. So, why am I getting a warning message as follows
22/09/05 01:17:38 INFO StandaloneAppClient$ClientEndpoint: Executor updated: app-20220905001717-0003/1 is now EXITED (Command exited with code 1)
22/09/05 01:17:38 INFO StandaloneSchedulerBackend: Executor app-20220905001717-0003/1 removed: Command exited with code 1
22/09/05 01:17:38 INFO BlockManagerMasterEndpoint: Trying to remove executor 1 from BlockManagerMaster.
22/09/05 01:17:38 INFO BlockManagerMaster: Removal of executor 1 requested
22/09/05 01:17:38 INFO StandaloneAppClient$ClientEndpoint: Executor added: app-20220905001717-0003/2 on worker-20220905000436-172.18.0.3-8082 (172.18.0.3:8082) with 8 core(s)
22/09/05 01:17:38 INFO CoarseGrainedSchedulerBackend$DriverEndpoint: Asked to remove non-existent executor 1
22/09/05 01:17:38 INFO StandaloneSchedulerBackend: Granted executor ID app-20220905001717-0003/2 on hostPort 172.18.0.3:8082 with 8 core(s), 1024.0 MiB RAM
22/09/05 01:17:38 INFO StandaloneAppClient$ClientEndpoint: Executor updated: app-20220905001717-0003/2 is now RUNNING
22/09/05 01:17:40 WARN TaskSchedulerImpl: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient resources