Query error - SparkContext.assertNotStopped

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I'm working with Spark Structured Streaming for communication with streams and I'm performing a query and I'm getting this error but I don't know why.

I receive the data from a stream and with a select I extract the data that I am going to send to another stream.

My code is developed with Scala

org.apache.spark.SparkContext.assertNotStopped
org.apache.spark.SparkContext.defaultParallelism

I have tried to import after creating the Spark session but it does not use the implicits._ import at all.

What is the reason for this error? It's because of spark.stop ?

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